feat(cli): add polar as better-auth plugin (#578)

apps/cli/src/constants.ts

@@ -13,6 +13,7 @@ export const DEFAULT_CONFIG_BASE = {
 	database: "sqlite",
 	orm: "drizzle",
 	auth: "better-auth",
+	payments: "none",
 	addons: ["turborepo"],
 	examples: [],
 	git: true,
@@ -39,8 +40,8 @@ export function getDefaultConfig() {
 export const DEFAULT_CONFIG = getDefaultConfig();
 
 export const dependencyVersionMap = {
-	"better-auth": "^1.3.9",
-	"@better-auth/expo": "^1.3.9",
+	"better-auth": "^1.3.10",
+	"@better-auth/expo": "^1.3.10",
 
 	"@clerk/nextjs": "^6.31.5",
 	"@clerk/clerk-react": "^5.45.0",
@@ -139,9 +140,9 @@ export const dependencyVersionMap = {
 	"@tanstack/react-query-devtools": "^5.85.5",
 	"@tanstack/react-query": "^5.85.5",
 
-	"@tanstack/solid-query": "^5.75.0",
-	"@tanstack/solid-query-devtools": "^5.75.0",
-	"@tanstack/solid-router-devtools": "^1.131.25",
+	"@tanstack/solid-query": "^5.87.4",
+	"@tanstack/solid-query-devtools": "^5.87.4",
+	"@tanstack/solid-router-devtools": "^1.131.44",
 
 	wrangler: "^4.23.0",
 	"@cloudflare/vite-plugin": "^1.9.0",
@@ -155,6 +156,9 @@ export const dependencyVersionMap = {
 	nitropack: "^2.12.4",
 
 	dotenv: "^17.2.1",
+
+	"@polar-sh/better-auth": "^1.1.3",
+	"@polar-sh/sdk": "^0.34.16",
 } as const;
 
 export type AvailableDependencies = keyof typeof dependencyVersionMap;

apps/cli/src/helpers/core/add-addons.ts

@@ -2,8 +2,8 @@ import path from "node:path";
 import { log } from "@clack/prompts";
 import pc from "picocolors";
 import type { AddInput, Addons, ProjectConfig } from "../../types";
-import { validateAddonCompatibility } from "../../utils/addon-compatibility";
 import { updateBtsConfig } from "../../utils/bts-config";
+import { validateAddonCompatibility } from "../../utils/compatibility-rules";
 import { exitWithError } from "../../utils/errors";
 import { setupAddons } from "../addons/addons-setup";
 import {
@@ -45,6 +45,7 @@ export async function addAddonsToProject(
 			addons: input.addons,
 			examples: detectedConfig.examples || [],
 			auth: detectedConfig.auth || "none",
+			payments: detectedConfig.payments || "none",
 			git: false,
 			packageManager:
 				input.packageManager || detectedConfig.packageManager || "npm",

apps/cli/src/helpers/core/add-deployment.ts

@@ -69,6 +69,7 @@ export async function addDeploymentToProject(
 			addons: detectedConfig.addons || [],
 			examples: detectedConfig.examples || [],
 			auth: detectedConfig.auth || "none",
+			payments: detectedConfig.payments || "none",
 			git: false,
 			packageManager:
 				input.packageManager || detectedConfig.packageManager || "npm",

apps/cli/src/helpers/core/command-handlers.ts

@@ -103,6 +103,7 @@ export async function createProjectHandler(
 				addons: [],
 				examples: [],
 				auth: "none",
+				payments: "none",
 				git: false,
 				packageManager: "npm",
 				install: false,
@@ -272,6 +273,7 @@ export async function addAddonsHandler(input: AddInput) {
 			const addonsPrompt = await getAddonsToAdd(
 				detectedConfig.frontend || [],
 				detectedConfig.addons || [],
+				detectedConfig.auth,
 			);
 
 			if (addonsPrompt.length > 0) {

apps/cli/src/helpers/core/create-project.ts

@@ -17,6 +17,7 @@ import { createReadme } from "./create-readme";
 import { setupEnvironmentVariables } from "./env-setup";
 import { initializeGit } from "./git";
 import { installDependencies } from "./install-dependencies";
+import { setupPayments } from "./payments-setup";
 import { displayPostInstallInstructions } from "./post-installation";
 import { updatePackageConfigurations } from "./project-config";
 import {
@@ -30,6 +31,7 @@ import {
 	setupDockerComposeTemplates,
 	setupExamplesTemplate,
 	setupFrontendTemplates,
+	setupPaymentsTemplate,
 } from "./template-manager";
 
 export async function createProject(
@@ -50,6 +52,9 @@ export async function createProject(
 			await setupDockerComposeTemplates(projectDir, options);
 		}
 		await setupAuthTemplate(projectDir, options);
+		if (options.payments && options.payments !== "none") {
+			await setupPaymentsTemplate(projectDir, options);
+		}
 		if (options.examples.length > 0 && options.examples[0] !== "none") {
 			await setupExamplesTemplate(projectDir, options);
 		}
@@ -76,6 +81,10 @@ export async function createProject(
 			await setupAuth(options);
 		}
 
+		if (options.payments && options.payments !== "none") {
+			await setupPayments(options);
+		}
+
 		await handleExtras(projectDir, options);
 
 		await setupEnvironmentVariables(options);

apps/cli/src/helpers/core/detect-project-config.ts

@@ -17,6 +17,7 @@ export async function detectProjectConfig(projectDir: string) {
 				addons: btsConfig.addons,
 				examples: btsConfig.examples,
 				auth: btsConfig.auth,
+				payments: btsConfig.payments,
 				packageManager: btsConfig.packageManager,
 				dbSetup: btsConfig.dbSetup,
 				api: btsConfig.api,

apps/cli/src/helpers/core/env-setup.ts

@@ -280,6 +280,16 @@ export async function setupEnvironmentVariables(config: ProjectConfig) {
 			value: "",
 			condition: examples?.includes("ai") || false,
 		},
+		{
+			key: "POLAR_ACCESS_TOKEN",
+			value: "",
+			condition: config.payments === "polar",
+		},
+		{
+			key: "POLAR_SUCCESS_URL",
+			value: `${corsOrigin}/success?checkout_id={CHECKOUT_ID}`,
+			condition: config.payments === "polar",
+		},
 	];
 
 	await addEnvVariablesToFile(envPath, serverVars);

apps/cli/src/helpers/core/payments-setup.ts

@@ -0,0 +1,50 @@
+import path from "node:path";
+import fs from "fs-extra";
+import type { ProjectConfig } from "../../types";
+import { addPackageDependency } from "../../utils/add-package-deps";
+
+export async function setupPayments(config: ProjectConfig) {
+	const { payments, projectDir, frontend } = config;
+
+	if (!payments || payments === "none") {
+		return;
+	}
+
+	const serverDir = path.join(projectDir, "apps/server");
+	const clientDir = path.join(projectDir, "apps/web");
+
+	const serverDirExists = await fs.pathExists(serverDir);
+	const clientDirExists = await fs.pathExists(clientDir);
+
+	if (!serverDirExists) {
+		return;
+	}
+
+	if (payments === "polar") {
+		await addPackageDependency({
+			dependencies: ["@polar-sh/better-auth", "@polar-sh/sdk"],
+			projectDir: serverDir,
+		});
+
+		if (clientDirExists) {
+			const hasWebFrontend = frontend.some((f) =>
+				[
+					"react-router",
+					"tanstack-router",
+					"tanstack-start",
+					"next",
+					"nuxt",
+					"svelte",
+					"solid",
+				].includes(f),
+			);
+
+			if (hasWebFrontend) {
+				await addPackageDependency({
+					dependencies: ["@polar-sh/better-auth"],
+					projectDir: clientDir,
+				});
+			}
+		}
+	}
+}

apps/cli/src/helpers/core/post-installation.ts

@@ -72,6 +72,10 @@ export async function displayPostInstallInstructions(
 		: "";
 	const clerkInstructions =
 		isConvex && config.auth === "clerk" ? getClerkInstructions() : "";
+	const polarInstructions =
+		config.payments === "polar" && config.auth === "better-auth"
+			? getPolarInstructions()
+			: "";
 	const wranglerDeployInstructions = getWranglerDeployInstructions(
 		runCmd,
 		webDeploy,
@@ -188,6 +192,7 @@ export async function displayPostInstallInstructions(
 		output += `\n${alchemyDeployInstructions.trim()}\n`;
 	if (starlightInstructions) output += `\n${starlightInstructions.trim()}\n`;
 	if (clerkInstructions) output += `\n${clerkInstructions.trim()}\n`;
+	if (polarInstructions) output += `\n${polarInstructions.trim()}\n`;
 
 	if (noOrmWarning) output += `\n${noOrmWarning.trim()}\n`;
 	if (bunWebNativeWarning) output += `\n${bunWebNativeWarning.trim()}\n`;
@@ -447,6 +452,10 @@ function getClerkInstructions() {
 	return `${pc.bold("Clerk Authentication Setup:")}\n${pc.cyan("•")} Follow the guide: ${pc.underline("https://docs.convex.dev/auth/clerk")}\n${pc.cyan("•")} Set CLERK_JWT_ISSUER_DOMAIN in Convex Dashboard\n${pc.cyan("•")} Set CLERK_PUBLISHABLE_KEY in apps/*/.env`;
 }
 
+function getPolarInstructions() {
+	return `${pc.bold("Polar Payments Setup:")}\n${pc.cyan("•")} Get access token & product ID from ${pc.underline("https://sandbox.polar.sh/")}\n${pc.cyan("•")} Set POLAR_ACCESS_TOKEN in apps/server/.env`;
+}
+
 function getAlchemyDeployInstructions(
 	runCmd?: string,
 	webDeploy?: string,

apps/cli/src/helpers/core/template-manager.ts

@@ -607,6 +607,102 @@ export async function setupAuthTemplate(
 	}
 }
 
+export async function setupPaymentsTemplate(
+	projectDir: string,
+	context: ProjectConfig,
+) {
+	if (!context.payments || context.payments === "none") return;
+
+	const serverAppDir = path.join(projectDir, "apps/server");
+	const webAppDir = path.join(projectDir, "apps/web");
+
+	const serverAppDirExists = await fs.pathExists(serverAppDir);
+	const webAppDirExists = await fs.pathExists(webAppDir);
+
+	if (serverAppDirExists && context.backend !== "convex") {
+		const paymentsServerSrc = path.join(
+			PKG_ROOT,
+			`templates/payments/${context.payments}/server/base`,
+		);
+		if (await fs.pathExists(paymentsServerSrc)) {
+			await processAndCopyFiles(
+				"**/*",
+				paymentsServerSrc,
+				serverAppDir,
+				context,
+			);
+		}
+	}
+
+	const hasReactWeb = context.frontend.some((f) =>
+		["tanstack-router", "react-router", "tanstack-start", "next"].includes(f),
+	);
+	const hasNuxtWeb = context.frontend.includes("nuxt");
+	const hasSvelteWeb = context.frontend.includes("svelte");
+	const hasSolidWeb = context.frontend.includes("solid");
+
+	if (
+		webAppDirExists &&
+		(hasReactWeb || hasNuxtWeb || hasSvelteWeb || hasSolidWeb)
+	) {
+		if (hasReactWeb) {
+			const reactFramework = context.frontend.find((f) =>
+				["tanstack-router", "react-router", "tanstack-start", "next"].includes(
+					f,
+				),
+			);
+			if (reactFramework) {
+				const paymentsWebSrc = path.join(
+					PKG_ROOT,
+					`templates/payments/${context.payments}/web/react/${reactFramework}`,
+				);
+				if (await fs.pathExists(paymentsWebSrc)) {
+					await processAndCopyFiles("**/*", paymentsWebSrc, webAppDir, context);
+				}
+			}
+		} else if (hasNuxtWeb) {
+			const paymentsWebNuxtSrc = path.join(
+				PKG_ROOT,
+				`templates/payments/${context.payments}/web/nuxt`,
+			);
+			if (await fs.pathExists(paymentsWebNuxtSrc)) {
+				await processAndCopyFiles(
+					"**/*",
+					paymentsWebNuxtSrc,
+					webAppDir,
+					context,
+				);
+			}
+		} else if (hasSvelteWeb) {
+			const paymentsWebSvelteSrc = path.join(
+				PKG_ROOT,
+				`templates/payments/${context.payments}/web/svelte`,
+			);
+			if (await fs.pathExists(paymentsWebSvelteSrc)) {
+				await processAndCopyFiles(
+					"**/*",
+					paymentsWebSvelteSrc,
+					webAppDir,
+					context,
+				);
+			}
+		} else if (hasSolidWeb) {
+			const paymentsWebSolidSrc = path.join(
+				PKG_ROOT,
+				`templates/payments/${context.payments}/web/solid`,
+			);
+			if (await fs.pathExists(paymentsWebSolidSrc)) {
+				await processAndCopyFiles(
+					"**/*",
+					paymentsWebSolidSrc,
+					webAppDir,
+					context,
+				);
+			}
+		}
+	}
+}
+
 export async function setupAddonsTemplate(
 	projectDir: string,
 	context: ProjectConfig,

apps/cli/src/index.ts

@@ -32,6 +32,7 @@ import {
 	ORMSchema,
 	type PackageManager,
 	PackageManagerSchema,
+	PaymentsSchema,
 	type ProjectConfig,
 	ProjectNameSchema,
 	type Runtime,
@@ -80,6 +81,7 @@ export const router = t.router({
 					database: DatabaseSchema.optional(),
 					orm: ORMSchema.optional(),
 					auth: AuthSchema.optional(),
+					payments: PaymentsSchema.optional(),
 					frontend: z.array(FrontendSchema).optional(),
 					addons: z.array(AddonsSchema).optional(),
 					examples: z.array(ExamplesSchema).optional(),

apps/cli/src/prompts/addons.ts

@@ -1,10 +1,10 @@
 import { groupMultiselect, isCancel } from "@clack/prompts";
 import { DEFAULT_CONFIG } from "../constants";
-import { type Addons, AddonsSchema, type Frontend } from "../types";
+import { type Addons, AddonsSchema, type Auth, type Frontend } from "../types";
 import {
 	getCompatibleAddons,
 	validateAddonCompatibility,
-} from "../utils/addon-compatibility";
+} from "../utils/compatibility-rules";
 import { exitCancelled } from "../utils/errors";
 
 type AddonOption = {
@@ -75,6 +75,7 @@ const ADDON_GROUPS = {
 export async function getAddonsChoice(
 	addons?: Addons[],
 	frontends?: Frontend[],
+	auth?: Auth,
 ) {
 	if (addons !== undefined) return addons;
 
@@ -88,7 +89,11 @@ export async function getAddonsChoice(
 	const frontendsArray = frontends || [];
 
 	for (const addon of allAddons) {
-		const { isCompatible } = validateAddonCompatibility(addon, frontendsArray);
+		const { isCompatible } = validateAddonCompatibility(
+			addon,
+			frontendsArray,
+			auth,
+		);
 		if (!isCompatible) continue;
 
 		const { label, hint } = getAddonDisplay(addon);
@@ -131,6 +136,7 @@ export async function getAddonsChoice(
 export async function getAddonsToAdd(
 	frontend: Frontend[],
 	existingAddons: Addons[] = [],
+	auth?: Auth,
 ) {
 	const groupedOptions: Record<string, AddonOption[]> = {
 		Documentation: [],
@@ -144,6 +150,7 @@ export async function getAddonsToAdd(
 		AddonsSchema.options.filter((addon) => addon !== "none"),
 		frontendArray,
 		existingAddons,
+		auth,
 	);
 
 	for (const addon of compatibleAddons) {

apps/cli/src/prompts/config-prompts.ts

@@ -10,6 +10,7 @@ import type {
 	Frontend,
 	ORM,
 	PackageManager,
+	Payments,
 	ProjectConfig,
 	Runtime,
 	ServerDeploy,
@@ -28,6 +29,7 @@ import { getGitChoice } from "./git";
 import { getinstallChoice } from "./install";
 import { getORMChoice } from "./orm";
 import { getPackageManagerChoice } from "./package-manager";
+import { getPaymentsChoice } from "./payments";
 import { getRuntimeChoice } from "./runtime";
 import { getServerDeploymentChoice } from "./server-deploy";
 import { getDeploymentChoice } from "./web-deploy";
@@ -40,6 +42,7 @@ type PromptGroupResults = {
 	orm: ORM;
 	api: API;
 	auth: Auth;
+	payments: Payments;
 	addons: Addons[];
 	examples: Examples[];
 	dbSetup: DatabaseSetup;
@@ -87,7 +90,15 @@ export async function gatherConfig(
 					results.backend,
 					results.frontend,
 				),
-			addons: ({ results }) => getAddonsChoice(flags.addons, results.frontend),
+			payments: ({ results }) =>
+				getPaymentsChoice(
+					flags.payments,
+					results.auth,
+					results.backend,
+					results.frontend,
+				),
+			addons: ({ results }) =>
+				getAddonsChoice(flags.addons, results.frontend, results.auth),
 			examples: ({ results }) =>
 				getExamplesChoice(
 					flags.examples,
@@ -137,6 +148,7 @@ export async function gatherConfig(
 		database: result.database,
 		orm: result.orm,
 		auth: result.auth,
+		payments: result.payments,
 		addons: result.addons,
 		examples: result.examples,
 		git: result.git,

apps/cli/src/prompts/payments.ts

@@ -0,0 +1,46 @@
+import { isCancel, select } from "@clack/prompts";
+import { DEFAULT_CONFIG } from "../constants";
+import type { Auth, Backend, Frontend, Payments } from "../types";
+import { splitFrontends } from "../utils/compatibility-rules";
+import { exitCancelled } from "../utils/errors";
+
+export async function getPaymentsChoice(
+	payments?: Payments,
+	auth?: Auth,
+	backend?: Backend,
+	frontends?: Frontend[],
+) {
+	if (payments !== undefined) return payments;
+
+	const isPolarCompatible =
+		auth === "better-auth" &&
+		backend !== "convex" &&
+		(frontends?.length === 0 || splitFrontends(frontends).web.length > 0);
+
+	if (!isPolarCompatible) {
+		return "none" as Payments;
+	}
+
+	const options = [
+		{
+			value: "polar" as Payments,
+			label: "Polar",
+			hint: "Turn your software into a business. 6 lines of code.",
+		},
+		{
+			value: "none" as Payments,
+			label: "None",
+			hint: "No payments integration",
+		},
+	];
+
+	const response = await select<Payments>({
+		message: "Select payments provider",
+		options,
+		initialValue: DEFAULT_CONFIG.payments,
+	});
+
+	if (isCancel(response)) return exitCancelled("Operation cancelled");
+
+	return response;
+}

apps/cli/src/types.ts

@@ -86,6 +86,11 @@ export const AuthSchema = z
 	.describe("Authentication provider");
 export type Auth = z.infer<typeof AuthSchema>;
 
+export const PaymentsSchema = z
+	.enum(["polar", "none"])
+	.describe("Payments provider");
+export type Payments = z.infer<typeof PaymentsSchema>;
+
 export const ProjectNameSchema = z
 	.string()
 	.min(1, "Project name cannot be empty")
@@ -132,6 +137,7 @@ export type CreateInput = {
 	database?: Database;
 	orm?: ORM;
 	auth?: Auth;
+	payments?: Payments;
 	frontend?: Frontend[];
 	addons?: Addons[];
 	examples?: Examples[];
@@ -175,6 +181,7 @@ export interface ProjectConfig {
 	addons: Addons[];
 	examples: Examples[];
 	auth: Auth;
+	payments: Payments;
 	git: boolean;
 	packageManager: PackageManager;
 	install: boolean;
@@ -195,6 +202,7 @@ export interface BetterTStackConfig {
 	addons: Addons[];
 	examples: Examples[];
 	auth: Auth;
+	payments: Payments;
 	packageManager: PackageManager;
 	dbSetup: DatabaseSetup;
 	api: API;

apps/cli/src/utils/addon-compatibility.ts

@@ -1,42 +0,0 @@
-import { ADDON_COMPATIBILITY } from "../constants";
-import type { Addons, Frontend } from "../types";
-
-export function validateAddonCompatibility(
-	addon: Addons,
-	frontend: Frontend[],
-): { isCompatible: boolean; reason?: string } {
-	const compatibleFrontends = ADDON_COMPATIBILITY[addon];
-
-	if (compatibleFrontends.length === 0) {
-		return { isCompatible: true };
-	}
-
-	const hasCompatibleFrontend = frontend.some((f) =>
-		(compatibleFrontends as readonly string[]).includes(f),
-	);
-
-	if (!hasCompatibleFrontend) {
-		const frontendList = compatibleFrontends.join(", ");
-		return {
-			isCompatible: false,
-			reason: `${addon} addon requires one of these frontends: ${frontendList}`,
-		};
-	}
-
-	return { isCompatible: true };
-}
-
-export function getCompatibleAddons(
-	allAddons: Addons[],
-	frontend: Frontend[],
-	existingAddons: Addons[] = [],
-) {
-	return allAddons.filter((addon) => {
-		if (existingAddons.includes(addon)) return false;
-
-		if (addon === "none") return false;
-
-		const { isCompatible } = validateAddonCompatibility(addon, frontend);
-		return isCompatible;
-	});
-}

apps/cli/src/utils/bts-config.ts

@@ -18,6 +18,7 @@ export async function writeBtsConfig(projectConfig: ProjectConfig) {
 		addons: projectConfig.addons,
 		examples: projectConfig.examples,
 		auth: projectConfig.auth,
+		payments: projectConfig.payments,
 		packageManager: projectConfig.packageManager,
 		dbSetup: projectConfig.dbSetup,
 		api: projectConfig.api,

apps/cli/src/utils/compatibility-rules.ts

@@ -1,14 +1,16 @@
+import { ADDON_COMPATIBILITY } from "../constants";
 import type {
 	Addons,
 	API,
+	Auth,
 	Backend,
 	CLIInput,
 	Frontend,
+	Payments,
 	ProjectConfig,
 	ServerDeploy,
 	WebDeploy,
 } from "../types";
-import { validateAddonCompatibility } from "./addon-compatibility";
 import { WEB_FRAMEWORKS } from "./compatibility";
 import { exitWithError } from "./errors";
 
@@ -191,15 +193,57 @@ export function validateServerDeployRequiresBackend(
 	}
 }
 
+export function validateAddonCompatibility(
+	addon: Addons,
+	frontend: Frontend[],
+	_auth?: Auth,
+): { isCompatible: boolean; reason?: string } {
+	const compatibleFrontends = ADDON_COMPATIBILITY[addon];
+
+	if (compatibleFrontends.length > 0) {
+		const hasCompatibleFrontend = frontend.some((f) =>
+			(compatibleFrontends as readonly string[]).includes(f),
+		);
+
+		if (!hasCompatibleFrontend) {
+			const frontendList = compatibleFrontends.join(", ");
+			return {
+				isCompatible: false,
+				reason: `${addon} addon requires one of these frontends: ${frontendList}`,
+			};
+		}
+	}
+
+	return { isCompatible: true };
+}
+
+export function getCompatibleAddons(
+	allAddons: Addons[],
+	frontend: Frontend[],
+	existingAddons: Addons[] = [],
+	auth?: Auth,
+) {
+	return allAddons.filter((addon) => {
+		if (existingAddons.includes(addon)) return false;
+
+		if (addon === "none") return false;
+
+		const { isCompatible } = validateAddonCompatibility(addon, frontend, auth);
+		return isCompatible;
+	});
+}
+
 export function validateAddonsAgainstFrontends(
 	addons: Addons[] = [],
 	frontends: Frontend[] = [],
+	auth?: Auth,
 ) {
 	for (const addon of addons) {
 		if (addon === "none") continue;
 		const { isCompatible, reason } = validateAddonCompatibility(
 			addon,
 			frontends,
+			auth,
 		);
 		if (!isCompatible) {
 			exitWithError(`Incompatible addon/frontend combination: ${reason}`);
@@ -207,6 +251,36 @@ export function validateAddonsAgainstFrontends(
 	}
 }
 
+export function validatePaymentsCompatibility(
+	payments: Payments | undefined,
+	auth: Auth | undefined,
+	backend: Backend | undefined,
+	frontends: Frontend[] = [],
+) {
+	if (!payments || payments === "none") return;
+
+	if (payments === "polar") {
+		if (!auth || auth === "none" || auth !== "better-auth") {
+			exitWithError(
+				"Polar payments requires Better Auth. Please use '--auth better-auth' or choose a different payments provider.",
+			);
+		}
+
+		if (backend === "convex") {
+			exitWithError(
+				"Polar payments is not compatible with Convex backend. Please use a different backend or choose a different payments provider.",
+			);
+		}
+
+		const { web } = splitFrontends(frontends);
+		if (web.length === 0 && frontends.length > 0) {
+			exitWithError(
+				"Polar payments requires a web frontend or no frontend. Please select a web frontend or choose a different payments provider.",
+			);
+		}
+	}
+}
+
 export function validateExamplesCompatibility(
 	examples: string[] | undefined,
 	backend: ProjectConfig["backend"] | undefined,

apps/cli/src/utils/config-processing.ts

@@ -8,6 +8,7 @@ import type {
 	DatabaseSetup,
 	ORM,
 	PackageManager,
+	Payments,
 	ProjectConfig,
 	Runtime,
 	ServerDeploy,
@@ -56,6 +57,10 @@ export function processFlags(options: CLIInput, projectName?: string) {
 		config.auth = options.auth as Auth;
 	}
 
+	if (options.payments !== undefined) {
+		config.payments = options.payments as Payments;
+	}
+
 	if (options.git !== undefined) {
 		config.git = options.git;
 	}

apps/cli/src/utils/config-validation.ts

@@ -11,6 +11,7 @@ import {
 	validateAddonsAgainstFrontends,
 	validateApiFrontendCompatibility,
 	validateExamplesCompatibility,
+	validatePaymentsCompatibility,
 	validateServerDeployRequiresBackend,
 	validateWebDeployRequiresWebFrontend,
 	validateWorkersCompatibility,
@@ -417,7 +418,7 @@ export function validateFullConfig(
 	}
 
 	if (config.addons && config.addons.length > 0) {
-		validateAddonsAgainstFrontends(config.addons, config.frontend);
+		validateAddonsAgainstFrontends(config.addons, config.frontend, config.auth);
 		config.addons = [...new Set(config.addons)];
 	}
 
@@ -441,8 +442,19 @@ export function validateConfigForProgrammaticUse(
 
 		validateApiFrontendCompatibility(config.api, config.frontend);
 
+		validatePaymentsCompatibility(
+			config.payments,
+			config.auth,
+			config.backend,
+			config.frontend,
+		);
+
 		if (config.addons && config.addons.length > 0) {
-			validateAddonsAgainstFrontends(config.addons, config.frontend);
+			validateAddonsAgainstFrontends(
+				config.addons,
+				config.frontend,
+				config.auth,
+			);
 		}
 
 		validateExamplesCompatibility(

apps/cli/src/utils/display-config.ts

@@ -43,6 +43,10 @@ export function displayConfig(config: Partial<ProjectConfig>) {
 		configDisplay.push(`${pc.blue("Auth:")} ${String(config.auth)}`);
 	}
 
+	if (config.payments !== undefined) {
+		configDisplay.push(`${pc.blue("Payments:")} ${String(config.payments)}`);
+	}
+
 	if (config.addons !== undefined) {
 		const addons = Array.isArray(config.addons)
 			? config.addons

apps/cli/src/utils/generate-reproducible-command.ts

@@ -15,6 +15,7 @@ export function generateReproducibleCommand(config: ProjectConfig) {
 	flags.push(`--orm ${config.orm}`);
 	flags.push(`--api ${config.api}`);
 	flags.push(`--auth ${config.auth}`);
+	flags.push(`--payments ${config.payments}`);
 
 	if (config.addons && config.addons.length > 0) {
 		flags.push(`--addons ${config.addons.join(" ")}`);

apps/cli/templates/auth/better-auth/server/base/src/lib/auth.ts.hbs

@@ -4,6 +4,10 @@ import { prismaAdapter } from "better-auth/adapters/prisma";
 {{#if (or (includes frontend "native-nativewind") (includes frontend "native-unistyles"))}}
 import { expo } from "@better-auth/expo";
 {{/if}}
+{{#if (eq payments "polar")}}
+import { polar, checkout, portal } from "@polar-sh/better-auth";
+import { polarClient } from "./payments";
+{{/if}}
 import prisma from "../db";
 
 export const auth = betterAuth<BetterAuthOptions>({
@@ -28,9 +32,35 @@ export const auth = betterAuth<BetterAuthOptions>({
       secure: true,
       httpOnly: true,
     },
-  }
+  },
+  {{#if (eq payments "polar")}}
+  plugins: [
+    polar({
+      client: polarClient,
+      createCustomerOnSignUp: true,
+      enableCustomerPortal: true,
+      use: [
+        checkout({
+          products: [
+            {
+              productId: "your-product-id",
+              slug: "pro",
+            },
+          ],
+          successUrl: process.env.POLAR_SUCCESS_URL,
+          authenticatedUsersOnly: true,
+        }),
+        portal(),
+      ],
+    }),
     {{#if (or (includes frontend "native-nativewind") (includes frontend "native-unistyles"))}}
-  , plugins: [expo()]
+    expo(),
+    {{/if}}
+  ],
+  {{else}}
+  {{#if (or (includes frontend "native-nativewind") (includes frontend "native-unistyles"))}}
+  plugins: [expo()],
+  {{/if}}
   {{/if}}
 });
 {{/if}}
@@ -42,6 +72,10 @@ import { drizzleAdapter } from "better-auth/adapters/drizzle";
 {{#if (or (includes frontend "native-nativewind") (includes frontend "native-unistyles"))}}
 import { expo } from "@better-auth/expo";
 {{/if}}
+{{#if (eq payments "polar")}}
+import { polar, checkout, portal } from "@polar-sh/better-auth";
+import { polarClient } from "./payments";
+{{/if}}
 import { db } from "../db";
 import * as schema from "../db/schema/auth";
 
@@ -68,9 +102,35 @@ export const auth = betterAuth<BetterAuthOptions>({
       httpOnly: true,
     },
   },
+  {{#if (eq payments "polar")}}
+  plugins: [
+    polar({
+      client: polarClient,
+      createCustomerOnSignUp: true,
+      enableCustomerPortal: true,
+      use: [
+        checkout({
+          products: [
+            {
+              productId: "your-product-id",
+              slug: "pro",
+            },
+          ],
+          successUrl: process.env.POLAR_SUCCESS_URL,
+          authenticatedUsersOnly: true,
+        }),
+        portal(),
+      ],
+    }),
+    {{#if (or (includes frontend "native-nativewind") (includes frontend "native-unistyles"))}}
+    expo(),
+    {{/if}}
+  ],
+  {{else}}
   {{#if (or (includes frontend "native-nativewind") (includes frontend "native-unistyles"))}}
   plugins: [expo()],
   {{/if}}
+  {{/if}}
 });
 {{/if}}
 
@@ -80,6 +140,10 @@ import { drizzleAdapter } from "better-auth/adapters/drizzle";
 {{#if (or (includes frontend "native-nativewind") (includes frontend "native-unistyles"))}}
 import { expo } from "@better-auth/expo";
 {{/if}}
+{{#if (eq payments "polar")}}
+import { polar, checkout, portal } from "@polar-sh/better-auth";
+import { polarClient } from "./payments";
+{{/if}}
 import { db } from "../db";
 import * as schema from "../db/schema/auth";
 import { env } from "cloudflare:workers";
@@ -109,9 +173,32 @@ export const auth = betterAuth<BetterAuthOptions>({
       httpOnly: true,
     },
   },
+  {{#if (eq payments "polar")}}
+  plugins: [
+    polar({
+      client: polarClient,
+      createCustomerOnSignUp: true,
+      enableCustomerPortal: true,
+      use: [
+        checkout({
+          products: [
+            {
+              productId: "your-product-id",
+              slug: "pro",
+            },
+          ],
+          successUrl: env.POLAR_SUCCESS_URL,
+          authenticatedUsersOnly: true,
+        }),
+        portal(),
+      ],
+    }),
+  ],
+  {{else}}
   {{#if (or (includes frontend "native-nativewind") (includes frontend "native-unistyles"))}}
   plugins: [expo()],
   {{/if}}
+  {{/if}}
 });
 {{/if}}
 {{/if}}
@@ -122,6 +209,10 @@ import { mongodbAdapter } from "better-auth/adapters/mongodb";
 {{#if (or (includes frontend "native-nativewind") (includes frontend "native-unistyles"))}}
 import { expo } from "@better-auth/expo";
 {{/if}}
+{{#if (eq payments "polar")}}
+import { polar, checkout, portal } from "@polar-sh/better-auth";
+import { polarClient } from "./payments";
+{{/if}}
 import { client } from "../db";
 
 export const auth = betterAuth<BetterAuthOptions>({
@@ -141,9 +232,35 @@ export const auth = betterAuth<BetterAuthOptions>({
       secure: true,
       httpOnly: true,
     },
-  }
+  },
+  {{#if (eq payments "polar")}}
+  plugins: [
+    polar({
+      client: polarClient,
+      createCustomerOnSignUp: true,
+      enableCustomerPortal: true,
+      use: [
+        checkout({
+          products: [
+            {
+              productId: "your-product-id",
+              slug: "pro",
+            },
+          ],
+          successUrl: process.env.POLAR_SUCCESS_URL,
+          authenticatedUsersOnly: true,
+        }),
+        portal(),
+      ],
+    }),
     {{#if (or (includes frontend "native-nativewind") (includes frontend "native-unistyles"))}}
-  , plugins: [expo()]
+    expo(),
+    {{/if}}
+  ],
+  {{else}}
+  {{#if (or (includes frontend "native-nativewind") (includes frontend "native-unistyles"))}}
+  plugins: [expo()],
+  {{/if}}
   {{/if}}
 });
 {{/if}}
@@ -153,6 +270,10 @@ import { betterAuth, type BetterAuthOptions } from "better-auth";
 {{#if (or (includes frontend "native-nativewind") (includes frontend "native-unistyles"))}}
 import { expo } from "@better-auth/expo";
 {{/if}}
+{{#if (eq payments "polar")}}
+import { polar, checkout, portal } from "@polar-sh/better-auth";
+import { polarClient } from "./payments";
+{{/if}}
 
 export const auth = betterAuth<BetterAuthOptions>({
   database: "", // Invalid configuration
@@ -171,9 +292,35 @@ export const auth = betterAuth<BetterAuthOptions>({
       secure: true,
       httpOnly: true,
     },
-  }
+  },
+  {{#if (eq payments "polar")}}
+  plugins: [
+    polar({
+      client: polarClient,
+      createCustomerOnSignUp: true,
+      enableCustomerPortal: true,
+      use: [
+        checkout({
+          products: [
+            {
+              productId: "your-product-id",
+              slug: "pro",
+            },
+          ],
+          successUrl: process.env.POLAR_SUCCESS_URL,
+          authenticatedUsersOnly: true,
+        }),
+        portal(),
+      ],
+    }),
     {{#if (or (includes frontend "native-nativewind") (includes frontend "native-unistyles"))}}
-  , plugins: [expo()]
+    expo(),
+    {{/if}}
+  ],
+  {{else}}
+  {{#if (or (includes frontend "native-nativewind") (includes frontend "native-unistyles"))}}
+  plugins: [expo()],
+  {{/if}}
   {{/if}}
 });
 {{/if}}

apps/cli/templates/auth/better-auth/web/nuxt/app/pages/dashboard.vue.hbs

@@ -11,9 +11,28 @@ definePageMeta({
 const { $orpc } = useNuxtApp()
 
 const session = $authClient.useSession()
+{{#if (eq payments "polar")}}
+const customerState = ref<any>(null)
+{{/if}}
 
 {{#if (eq api "orpc")}}
-const privateData = useQuery($orpc.privateData.queryOptions())
+const privateData = useQuery({
+  ...$orpc.privateData.queryOptions(),
+  enabled: computed(() => !!session.value?.data?.user)
+})
+{{/if}}
+
+{{#if (eq payments "polar")}}
+onMounted(async () => {
+  if (session.value?.data) {
+    const { data } = await $authClient.customer.state()
+    customerState.value = data
+  }
+})
+
+const hasProSubscription = computed(() => 
+  customerState.value?.activeSubscriptions?.length! > 0
+)
 {{/if}}
 
 </script>
@@ -27,7 +46,22 @@ const privateData = useQuery($orpc.privateData.queryOptions())
     {{#if (eq api "orpc")}}
     <div v-if="privateData.status.value === 'pending'">Loading private data...</div>
     <div v-else-if="privateData.status.value === 'error'">Error loading private data: \{{ privateData.error.value?.message }}</div>
-    <p v-else-if="privateData.data.value">Private Data: \{{ privateData.data.value.message }}</p>
+    <p v-else-if="privateData.data.value">API: \{{ privateData.data.value.message }}</p>
+    {{/if}}
+    {{#if (eq payments "polar")}}
+    <p class="mb-2">Plan: \{{ hasProSubscription ? "Pro" : "Free" }}</p>
+    <UButton 
+      v-if="hasProSubscription"
+      @click="() => { $authClient.customer.portal() }"
+    >
+      Manage Subscription
+    </UButton>
+    <UButton 
+      v-else
+      @click="() => { $authClient.checkout({ slug: 'pro' }) }"
+    >
+      Upgrade to Pro
+    </UButton>
     {{/if}}
   </div>
 </template>

apps/cli/templates/auth/better-auth/web/nuxt/app/plugins/auth-client.ts

@@ -1,16 +0,0 @@
-import { createAuthClient } from "better-auth/vue";
-
-export default defineNuxtPlugin(nuxtApp => {
-  const config = useRuntimeConfig()
-  const serverUrl = config.public.serverURL
-
-  const authClient = createAuthClient({
-    baseURL: serverUrl
-  })
-
-  return {
-    provide: {
-      authClient: authClient
-    }
-  }
-})

apps/cli/templates/auth/better-auth/web/nuxt/app/plugins/auth-client.ts.hbs

@@ -0,0 +1,22 @@
+import { createAuthClient } from "better-auth/vue";
+{{#if (eq payments "polar")}}
+import { polarClient } from "@polar-sh/better-auth";
+{{/if}}
+
+export default defineNuxtPlugin((nuxtApp) => {
+  const config = useRuntimeConfig();
+  const serverUrl = config.public.serverURL;
+
+  const authClient = createAuthClient({
+    baseURL: serverUrl,
+    {{#if (eq payments "polar")}}
+    plugins: [polarClient()],
+    {{/if}}
+  });
+
+  return {
+    provide: {
+      authClient: authClient,
+    },
+  };
+});

apps/cli/templates/auth/better-auth/web/react/base/src/lib/auth-client.ts.hbs

@@ -1,4 +1,7 @@
 import { createAuthClient } from "better-auth/react";
+{{#if (eq payments "polar")}}
+import { polarClient } from "@polar-sh/better-auth";
+{{/if}}
 
 export const authClient = createAuthClient({
   baseURL:
@@ -7,4 +10,7 @@ export const authClient = createAuthClient({
     {{else}}
       import.meta.env.VITE_SERVER_URL,
     {{/if}}
+{{#if (eq payments "polar")}}
+  plugins: [polarClient()]
+{{/if}}
 });

apps/cli/templates/auth/better-auth/web/react/next/src/app/dashboard/dashboard.tsx.hbs

@@ -0,0 +1,58 @@
+"use client";
+import { Button } from "@/components/ui/button";
+import { authClient } from "@/lib/auth-client";
+{{#if (eq api "orpc")}}
+import { useQuery } from "@tanstack/react-query";
+import { orpc } from "@/utils/orpc";
+{{/if}}
+{{#if (eq api "trpc")}}
+import { useQuery } from "@tanstack/react-query";
+import { trpc } from "@/utils/trpc";
+{{/if}}
+
+export default function Dashboard({
+	{{#if (eq payments "polar")}}
+	customerState,
+	{{/if}}
+	session
+}: {
+	{{#if (eq payments "polar")}}
+	customerState: ReturnType<typeof authClient.customer.state>;
+	{{/if}}
+	session: typeof authClient.$Infer.Session;
+}) {
+	{{#if (eq api "orpc")}}
+	const privateData = useQuery(orpc.privateData.queryOptions());
+	{{/if}}
+	{{#if (eq api "trpc")}}
+	const privateData = useQuery(trpc.privateData.queryOptions());
+	{{/if}}
+
+	{{#if (eq payments "polar")}}
+	const hasProSubscription = customerState?.activeSubscriptions?.length! > 0;
+	console.log("Active subscriptions:", customerState?.activeSubscriptions);
+	{{/if}}
+
+	return (
+		<>
+			{{#if (eq api "orpc")}}
+			<p>API: {privateData.data?.message}</p>
+			{{/if}}
+			{{#if (eq api "trpc")}}
+			<p>API: {privateData.data?.message}</p>
+			{{/if}}
+			{{#if (eq payments "polar")}}
+			<p>Plan: {hasProSubscription ? "Pro" : "Free"}</p>
+			{hasProSubscription ? (
+				<Button onClick={async () => await authClient.customer.portal()}>
+					Manage Subscription
+				</Button>
+			) : (
+				<Button onClick={async () => await authClient.checkout({ slug: "pro" })}>
+					Upgrade to Pro
+				</Button>
+			)}
+			{{/if}}
+		</>
+	);
+}

apps/cli/templates/auth/better-auth/web/react/next/src/app/dashboard/page.tsx.hbs

@@ -1,47 +1,37 @@
-"use client"
 import { authClient } from "@/lib/auth-client";
-{{#if (eq api "orpc")}}
-import { useQuery } from "@tanstack/react-query";
-import { orpc } from "@/utils/orpc";
-{{/if}}
-{{#if (eq api "trpc")}}
-import { useQuery } from "@tanstack/react-query";
-import { trpc } from "@/utils/trpc";
-{{/if}}
-import { useRouter } from "next/navigation";
-import { useEffect } from "react";
+import { redirect } from "next/navigation";
+import Dashboard from "./dashboard";
+import { headers } from "next/headers";
 
-export default function Dashboard() {
-  const router = useRouter();
-  const { data: session, isPending } = authClient.useSession();
-
-  {{#if (eq api "orpc")}}
-  const privateData = useQuery(orpc.privateData.queryOptions());
-  {{/if}}
-  {{#if (eq api "trpc")}}
-  const privateData = useQuery(trpc.privateData.queryOptions());
-  {{/if}}
-
-  useEffect(() => {
-    if (!session && !isPending) {
-      router.push("/login");
+export default async function DashboardPage() {
+	const session = await authClient.getSession({
+		fetchOptions: {
+			headers: await headers()
 		}
-  }, [session, isPending]);
+	});
 
-  if (isPending) {
-    return <div>Loading...</div>;
+	if (!session.data) {
+		redirect("/login");
 	}
 
+	{{#if (eq payments "polar")}}
+	const { data: customerState, error } = await authClient.customer.state({
+		fetchOptions: {
+			headers: await headers()
+		}
+	});
+	{{/if}}
+
 	return (
 		<div>
 			<h1>Dashboard</h1>
-      <p>Welcome {session?.user.name}</p>
-      {{#if (eq api "orpc")}}
-      <p>privateData: {privateData.data?.message}</p>
-      {{/if}}
-      {{#if (eq api "trpc")}}
-      <p>privateData: {privateData.data?.message}</p>
+			<p>Welcome {session.data.user.name}</p>
+			<Dashboard 
+				session={session.data}
+				{{#if (eq payments "polar")}}
+				customerState={customerState}
 				{{/if}}
+			/>
 		</div>
 	);
 }

apps/cli/templates/auth/better-auth/web/react/react-router/src/routes/dashboard.tsx.hbs

@@ -1,3 +1,4 @@
+import { Button } from "@/components/ui/button";
 import { authClient } from "@/lib/auth-client";
 {{#if (eq api "orpc")}}
 import { orpc } from "@/utils/orpc";
@@ -8,12 +9,15 @@ import { trpc } from "@/utils/trpc";
 {{#if ( or (eq api "orpc") (eq api "trpc"))}}
 import { useQuery } from "@tanstack/react-query";
 {{/if}}
-import { useEffect } from "react";
+import { useEffect, useState } from "react";
 import { useNavigate } from "react-router";
 
 export default function Dashboard() {
   const { data: session, isPending } = authClient.useSession();
   const navigate = useNavigate();
+  {{#if (eq payments "polar")}}
+  const [customerState, setCustomerState] = useState<any>(null);
+  {{/if}}
 
   {{#if (eq api "orpc")}}
   const privateData = useQuery(orpc.privateData.queryOptions());
@@ -26,18 +30,48 @@ export default function Dashboard() {
     if (!session && !isPending) {
       navigate("/login");
     }
-  }, [session, isPending]);
+  }, [session, isPending, navigate]);
+
+  {{#if (eq payments "polar")}}
+  useEffect(() => {
+    async function fetchCustomerState() {
+      if (session) {
+        const { data } = await authClient.customer.state();
+        setCustomerState(data);
+      }
+    }
+
+    fetchCustomerState();
+  }, [session]);
+  {{/if}}
 
   if (isPending) {
     return <div>Loading...</div>;
   }
 
+  {{#if (eq payments "polar")}}
+  const hasProSubscription = customerState?.activeSubscriptions?.length! > 0;
+  console.log("Active subscriptions:", customerState?.activeSubscriptions);
+  {{/if}}
+
   return (
     <div>
       <h1>Dashboard</h1>
       <p>Welcome {session?.user.name}</p>
       {{#if ( or (eq api "orpc") (eq api "trpc"))}}
-      <p>privateData: {privateData.data?.message}</p>
+      <p>API: {privateData.data?.message}</p>
+      {{/if}}
+      {{#if (eq payments "polar")}}
+      <p>Plan: {hasProSubscription ? "Pro" : "Free"}</p>
+      {hasProSubscription ? (
+        <Button onClick={async () => await authClient.customer.portal()}>
+          Manage Subscription
+        </Button>
+      ) : (
+        <Button onClick={async () => await authClient.checkout({ slug: "pro" })}>
+          Upgrade to Pro
+        </Button>
+      )}
       {{/if}}
     </div>
   );

apps/cli/templates/auth/better-auth/web/react/tanstack-router/src/routes/dashboard.tsx.hbs

@@ -1,3 +1,4 @@
+import { Button } from "@/components/ui/button";
 import { authClient } from "@/lib/auth-client";
 {{#if (eq api "orpc")}}
 import { orpc } from "@/utils/orpc";
@@ -8,17 +9,29 @@ import { trpc } from "@/utils/trpc";
 {{#if ( or (eq api "orpc") (eq api "trpc"))}}
 import { useQuery } from "@tanstack/react-query";
 {{/if}}
-import { createFileRoute } from "@tanstack/react-router";
-import { useEffect } from "react";
+import { createFileRoute, redirect } from "@tanstack/react-router";
 
 export const Route = createFileRoute("/dashboard")({
 	component: RouteComponent,
+	beforeLoad: async () => {
+		const session = await authClient.getSession();
+		if (!session.data) {
+			redirect({
+				to: "/login",
+				throw: true
+			});
+		}
+		{{#if (eq payments "polar")}}
+		const {data: customerState} = await authClient.customer.state()
+		return { session, customerState };
+		{{else}}
+		return { session };
+		{{/if}}
+	}
 });
 
 function RouteComponent() {
-  const { data: session, isPending } = authClient.useSession();
-
-  const navigate = Route.useNavigate();
+	const { session{{#if (eq payments "polar")}}, customerState{{/if}} } = Route.useRouteContext();
 
 	{{#if (eq api "orpc")}}
 	const privateData = useQuery(orpc.privateData.queryOptions());
@@ -27,24 +40,29 @@ function RouteComponent() {
 	const privateData = useQuery(trpc.privateData.queryOptions());
 	{{/if}}
 
-  useEffect(() => {
-    if (!session && !isPending) {
-      navigate({
-        to: "/login",
-      });
-    }
-  }, [session, isPending]);
-
-  if (isPending) {
-    return <div>Loading...</div>;
-  }
+	{{#if (eq payments "polar")}}
+	const hasProSubscription = customerState?.activeSubscriptions?.length! > 0
+    console.log("Active subscriptions:", customerState?.activeSubscriptions)
+	{{/if}}
 
 	return (
 		<div>
 			<h1>Dashboard</h1>
-      <p>Welcome {session?.user.name}</p>
+			<p>Welcome {session.data?.user.name}</p>
 			{{#if ( or (eq api "orpc") (eq api "trpc"))}}
-      <p>privateData: {privateData.data?.message}</p>
+			<p>API: {privateData.data?.message}</p>
+			{{/if}}
+			{{#if (eq payments "polar")}}
+			<p>Plan: {hasProSubscription ? "Pro" : "Free"}</p>
+			{hasProSubscription ? (
+				<Button onClick={async () => await authClient.customer.portal()}>
+					Manage Subscription
+				</Button>
+			) : (
+				<Button onClick={async () => await authClient.checkout({ slug: "pro" })}>
+					Upgrade to Pro
+				</Button>
+			)}
 			{{/if}}
 		</div>
 	);

apps/cli/templates/auth/better-auth/web/react/tanstack-start/src/routes/dashboard.tsx.hbs

@@ -1,3 +1,4 @@
+import { Button } from "@/components/ui/button";
 import { authClient } from "@/lib/auth-client";
 {{#if (eq api "trpc")}}
 import { useTRPC } from "@/utils/trpc";
@@ -7,47 +8,61 @@ import { useQuery } from "@tanstack/react-query";
 import { orpc } from "@/utils/orpc";
 import { useQuery } from "@tanstack/react-query";
 {{/if}}
-import { createFileRoute } from "@tanstack/react-router";
-import { useEffect } from "react";
+import { createFileRoute, redirect } from "@tanstack/react-router";
 
 export const Route = createFileRoute("/dashboard")({
 	component: RouteComponent,
+	beforeLoad: async () => {
+		const session = await authClient.getSession();
+		if (!session.data) {
+			redirect({
+				to: "/login",
+				throw: true
+			});
+		}
+		{{#if (eq payments "polar")}}
+		const {data: customerState} = await authClient.customer.state()
+		return { session, customerState };
+		{{else}}
+		return { session };
+		{{/if}}
+	}
 });
 
 function RouteComponent() {
-  const navigate = Route.useNavigate();
-  {{#if (eq api "trpc")}}
-  const trpc = useTRPC();
-  {{/if}}
-  {{#if (eq api "orpc")}}
-  {{/if}}
-  const { data: session, isPending } = authClient.useSession();
+	const { session{{#if (eq payments "polar")}}, customerState{{/if}} } = Route.useRouteContext();
 
 	{{#if (eq api "trpc")}}
+	const trpc = useTRPC();
 	const privateData = useQuery(trpc.privateData.queryOptions());
 	{{/if}}
 	{{#if (eq api "orpc")}}
 	const privateData = useQuery(orpc.privateData.queryOptions());
 	{{/if}}
 
-  useEffect(() => {
-    if (!session && !isPending) {
-      navigate({
-        to: "/login",
-      });
-    }
-  }, [session, isPending]);
-
-  if (isPending) {
-    return <div>Loading...</div>;
-  }
+	{{#if (eq payments "polar")}}
+	const hasProSubscription = customerState?.activeSubscriptions?.length! > 0
+    console.log("Active subscriptions:", customerState?.activeSubscriptions)
+	{{/if}}
 
 	return (
 		<div>
 			<h1>Dashboard</h1>
-      <p>Welcome {session?.user.name}</p>
+			<p>Welcome {session.data?.user.name}</p>
 			{{#if ( or (eq api "orpc") (eq api "trpc"))}}
-      <p>privateData: {privateData.data?.message}</p>
+			<p>API: {privateData.data?.message}</p>
+			{{/if}}
+			{{#if (eq payments "polar")}}
+			<p>Plan: {hasProSubscription ? "Pro" : "Free"}</p>
+			{hasProSubscription ? (
+				<Button onClick={async () => await authClient.customer.portal()}>
+					Manage Subscription
+				</Button>
+			) : (
+				<Button onClick={async () => await authClient.checkout({ slug: "pro" })}>
+					Upgrade to Pro
+				</Button>
+			)}
 			{{/if}}
 		</div>
 	);

apps/cli/templates/auth/better-auth/web/solid/src/lib/auth-client.ts

@@ -1,5 +0,0 @@
-import { createAuthClient } from "better-auth/solid";
-
-export const authClient = createAuthClient({
-  baseURL: import.meta.env.VITE_SERVER_URL,
-});

apps/cli/templates/auth/better-auth/web/solid/src/lib/auth-client.ts.hbs

@@ -0,0 +1,11 @@
+import { createAuthClient } from "better-auth/solid";
+{{#if (eq payments "polar")}}
+import { polarClient } from "@polar-sh/better-auth";
+{{/if}}
+
+export const authClient = createAuthClient({
+  baseURL: import.meta.env.VITE_SERVER_URL,
+{{#if (eq payments "polar")}}
+  plugins: [polarClient()]
+{{/if}}
+});

apps/cli/templates/auth/better-auth/web/solid/src/routes/dashboard.tsx.hbs

@@ -3,42 +3,65 @@ import { authClient } from "@/lib/auth-client";
 import { orpc } from "@/utils/orpc";
 import { useQuery } from "@tanstack/solid-query";
 {{/if}}
-import { createFileRoute } from "@tanstack/solid-router";
-import { createEffect, Show } from "solid-js";
+import { createFileRoute, redirect } from "@tanstack/solid-router";
 
 export const Route = createFileRoute("/dashboard")({
 	component: RouteComponent,
+	beforeLoad: async () => {
+		const session = await authClient.getSession();
+		if (!session.data) {
+			redirect({
+				to: "/login",
+				throw: true,
+			});
+		}
+		{{#if (eq payments "polar")}}
+		const { data: customerState } = await authClient.customer.state();
+		return { session, customerState };
+		{{else}}
+		return { session };
+		{{/if}}
+	},
 });
 
 function RouteComponent() {
-  const session = authClient.useSession();
-  const navigate = Route.useNavigate();
+	const context = Route.useRouteContext();
+
+	const session = context().session;
+	{{#if (eq payments "polar")}}
+	const customerState = context().customerState;
+	{{/if}}
 
 	{{#if (eq api "orpc")}}
 	const privateData = useQuery(() => orpc.privateData.queryOptions());
 	{{/if}}
 
-  createEffect(() => {
-    if (!session().data && !session().isPending) {
-      navigate({
-        to: "/login",
-      });
-    }
-  });
+	{{#if (eq payments "polar")}}
+	const hasProSubscription = () =>
+		customerState?.activeSubscriptions?.length! > 0;
+	{{/if}}
 
 	return (
 		<div>
-      <Show when={session().isPending}>
-        <div>Loading...</div>
-      </Show>
-
-      <Show when={!session().isPending && session().data}>
 			<h1>Dashboard</h1>
-        <p>Welcome {session().data?.user.name}</p>
+			<p>Welcome {session.data?.user.name}</p>
 			{{#if (eq api "orpc")}}
-        <p>privateData: {privateData.data?.message}</p>
+			<p>API: {privateData.data?.message}</p>
+			{{/if}}
+			{{#if (eq payments "polar")}}
+			<p>Plan: {hasProSubscription() ? "Pro" : "Free"}</p>
+			{hasProSubscription() ? (
+				<button onClick={async () => await authClient.customer.portal()}>
+					Manage Subscription
+				</button>
+			) : (
+				<button
+					onClick={async () => await authClient.checkout({ slug: "pro" })}
+				>
+					Upgrade to Pro
+				</button>
+			)}
 			{{/if}}
-      </Show>
 		</div>
 	);
 }

apps/cli/templates/auth/better-auth/web/svelte/src/lib/auth-client.ts.hbs

@@ -1,6 +1,12 @@
 import { PUBLIC_SERVER_URL } from "$env/static/public";
 import { createAuthClient } from "better-auth/svelte";
+{{#if (eq payments "polar")}}
+import { polarClient } from "@polar-sh/better-auth";
+{{/if}}
 
 export const authClient = createAuthClient({
 	baseURL: PUBLIC_SERVER_URL,
+{{#if (eq payments "polar")}}
+	plugins: [polarClient()]
+{{/if}}
 });

apps/cli/templates/auth/better-auth/web/svelte/src/routes/dashboard/+page.svelte.hbs

@@ -6,7 +6,9 @@
 	import { orpc } from '$lib/orpc';
 	import { createQuery } from '@tanstack/svelte-query';
 	{{/if}}
-	import { get } from 'svelte/store';
+	{{#if (eq payments "polar")}}
+	let customerState: any = null;
+	{{/if}}
 
 	const sessionQuery = authClient.useSession();
 
@@ -15,10 +17,17 @@
     {{/if}}
 
 	onMount(() => {
-		const { data: session, isPending } = get(sessionQuery);
+		const { data: session, isPending } = $sessionQuery;
 		if (!session && !isPending) {
 			goto('/login');
 		}
+		{{#if (eq payments "polar")}}
+		if (session) {
+			authClient.customer.state().then(({ data }) => {
+				customerState = data;
+			});
+		}
+		{{/if}}
 	});
 </script>
 
@@ -30,7 +39,19 @@
 		<h1>Dashboard</h1>
 		<p>Welcome {$sessionQuery.data.user.name}</p>
 		{{#if (eq api "orpc")}}
-		<p>privateData: {$privateDataQuery.data?.message}</p>
+		<p>API: {$privateDataQuery.data?.message}</p>
+		{{/if}}
+		{{#if (eq payments "polar")}}
+		<p>Plan: {customerState?.activeSubscriptions?.length > 0 ? "Pro" : "Free"}</p>
+		{#if customerState?.activeSubscriptions?.length > 0}
+			<button onclick={async () => await authClient.customer.portal()}>
+				Manage Subscription
+			</button>
+		{:else}
+			<button onclick={async () => await authClient.checkout({ slug: "pro" })}>
+				Upgrade to Pro
+			</button>
+		{/if}
 		{{/if}}
 	</div>
 {/if}

apps/cli/templates/backend/server/server-base/package.json.hbs

@@ -17,7 +17,7 @@
     ],
     {{/if}}
 	"devDependencies": {
-		"tsdown": "^0.14.1",
+		"tsdown": "^0.15.1",
 		"typescript": "^5.8.2"
 	}
 }

apps/cli/templates/extras/bunfig.toml.hbs

@@ -1,2 +1,6 @@
 [install]
+{{#if (includes frontend "nuxt")}}
+# linker = "isolated"  # Commented out for Nuxt compatibility
+{{else}}
 linker = "isolated"
+{{/if}}

apps/cli/templates/frontend/react/tanstack-start/src/routes/__root.tsx.hbs

@@ -17,6 +17,10 @@ import appCss from "../index.css?url";
 import type { QueryClient } from "@tanstack/react-query";
 import type { ConvexQueryClient } from "@convex-dev/react-query";
 import type { ConvexReactClient } from "convex/react";
+{{else}}
+{{#if (or (eq api "trpc") (eq api "orpc"))}}
+import type { QueryClient } from "@tanstack/react-query";
+{{/if}}
 {{/if}}
 import Loader from "@/components/loader";
 

apps/cli/templates/frontend/solid/package.json.hbs

@@ -9,18 +9,18 @@
     "test": "vitest run"
   },
   "dependencies": {
-    "@tailwindcss/vite": "^4.0.6",
-    "@tanstack/router-plugin": "^1.109.2",
-    "@tanstack/solid-form": "^1.9.0",
-    "@tanstack/solid-router": "^1.110.0",
-    "lucide-solid": "^0.507.0",
-    "solid-js": "^1.9.4",
-    "tailwindcss": "^4.0.6",
+    "@tailwindcss/vite": "^4.1.13",
+    "@tanstack/router-plugin": "^1.131.44",
+    "@tanstack/solid-form": "^1.20.0",
+    "@tanstack/solid-router": "^1.131.44",
+    "lucide-solid": "^0.544.0",
+    "solid-js": "^1.9.9",
+    "tailwindcss": "^4.1.13",
     "zod": "^4.0.2"
   },
   "devDependencies": {
-    "typescript": "^5.7.2",
-    "vite": "^7.0.2",
-    "vite-plugin-solid": "^2.11.2"
+    "typescript": "^5.9.2",
+    "vite": "^7.1.5",
+    "vite-plugin-solid": "^2.11.8"
   }
 }

apps/cli/templates/payments/polar/server/base/src/lib/payments.ts.hbs

@@ -0,0 +1,6 @@
+import { Polar } from "@polar-sh/sdk";
+
+export const polarClient = new Polar({
+    accessToken: process.env.POLAR_ACCESS_TOKEN,
+    server: "sandbox",
+});

apps/cli/templates/payments/polar/web/nuxt/app/pages/success.vue.hbs

@@ -0,0 +1,11 @@
+<script setup lang="ts">
+const route = useRoute()
+const checkout_id = route.query.checkout_id as string
+</script>
+
+<template>
+  <div class="container mx-auto px-4 py-8">
+    <h1 class="text-2xl font-bold mb-4">Payment Successful!</h1>
+    <p v-if="checkout_id">Checkout ID: \{{ checkout_id }}</p>
+  </div>
+</template>

apps/cli/templates/payments/polar/web/react/next/src/app/success/page.tsx.hbs

@@ -0,0 +1,15 @@
+export default async function SuccessPage({
+    searchParams,
+}: {
+    searchParams: Promise<{ checkout_id: string }>
+}) {
+    const params = await searchParams;
+    const checkout_id = params.checkout_id;
+
+    return (
+        <div className="px-4 py-8">
+            <h1>Payment Successful!</h1>
+            {checkout_id && <p>Checkout ID: {checkout_id}</p>}
+        </div>
+    );
+}

apps/cli/templates/payments/polar/web/react/react-router/src/routes/success.tsx.hbs

@@ -0,0 +1,13 @@
+import { useSearchParams } from "react-router";
+
+export default function SuccessPage() {
+    const [searchParams] = useSearchParams();
+    const checkout_id = searchParams.get("checkout_id");
+
+    return (
+        <div className="container mx-auto px-4 py-8">
+            <h1>Payment Successful!</h1>
+            {checkout_id && <p>Checkout ID: {checkout_id}</p>}
+        </div>
+    );
+}

apps/cli/templates/payments/polar/web/react/tanstack-router/src/routes/success.tsx.hbs

@@ -0,0 +1,19 @@
+import { createFileRoute, useSearch } from "@tanstack/react-router";
+
+export const Route = createFileRoute("/success")({
+	component: SuccessPage,
+	validateSearch: (search) => ({
+		checkout_id: search.checkout_id as string,
+	}),
+});
+
+function SuccessPage() {
+	const { checkout_id } = useSearch({ from: "/success" });
+
+	return (
+		<div className="container mx-auto px-4 py-8">
+			<h1>Payment Successful!</h1>
+			{checkout_id && <p>Checkout ID: {checkout_id}</p>}
+		</div>
+	);
+}

apps/cli/templates/payments/polar/web/react/tanstack-start/src/routes/success.tsx.hbs

@@ -0,0 +1,19 @@
+import { createFileRoute, useSearch } from "@tanstack/react-router";
+
+export const Route = createFileRoute("/success")({
+	component: SuccessPage,
+	validateSearch: (search) => ({
+		checkout_id: search.checkout_id as string,
+	}),
+});
+
+function SuccessPage() {
+	const { checkout_id } = useSearch({ from: "/success" });
+
+	return (
+		<div className="container mx-auto px-4 py-8">
+			<h1>Payment Successful!</h1>
+			{checkout_id && <p>Checkout ID: {checkout_id}</p>}
+		</div>
+	);
+}

apps/cli/templates/payments/polar/web/solid/src/routes/success.tsx.hbs

@@ -0,0 +1,23 @@
+import { createFileRoute } from "@tanstack/solid-router";
+import { Show } from "solid-js";
+
+export const Route = createFileRoute("/success")({
+	component: SuccessPage,
+	validateSearch: (search) => ({
+		checkout_id: search.checkout_id as string,
+	}),
+});
+
+function SuccessPage() {
+	const searchParams = Route.useSearch();
+	const checkout_id = searchParams().checkout_id;
+
+	return (
+		<div class="container mx-auto px-4 py-8">
+			<h1>Payment Successful!</h1>
+			<Show when={checkout_id}>
+				<p>Checkout ID: {checkout_id}</p>
+			</Show>
+		</div>
+	);
+}

apps/cli/templates/payments/polar/web/svelte/src/routes/success/+page.svelte.hbs

@@ -0,0 +1,12 @@
+<script lang="ts">
+	import { page } from '$app/stores';
+	
+	const checkout_id = $page.url.searchParams.get('checkout_id');
+</script>
+
+<div class="container mx-auto px-4 py-8">
+	<h1>Payment Successful!</h1>
+	{#if checkout_id}
+		<p>Checkout ID: {checkout_id}</p>
+	{/if}
+</div>

apps/web/src/app/(home)/new/_components/tech-icon.tsx

@@ -30,7 +30,8 @@ export function TechIcon({
 			icon.includes("prisma") ||
 			icon.includes("express") ||
 			icon.includes("clerk") ||
-			icon.includes("planetscale"))
+			icon.includes("planetscale") ||
+			icon.includes("polar"))
 	) {
 		iconSrc = icon.replace(".svg", "-light.svg");
 	}

apps/web/src/app/(home)/new/_components/utils.ts

@@ -818,6 +818,64 @@ export const analyzeStackCompatibility = (
 				});
 			}
 
+			if (nextStack.payments === "polar") {
+				if (nextStack.auth !== "better-auth") {
+					notes.payments.notes.push(
+						"Polar payments requires Better Auth. Payments will be set to 'None'.",
+					);
+					notes.auth.notes.push(
+						"Polar payments requires Better Auth. Payments will be disabled.",
+					);
+					notes.payments.hasIssue = true;
+					notes.auth.hasIssue = true;
+					nextStack.payments = "none";
+					changed = true;
+					changes.push({
+						category: "payments",
+						message: "Payments set to 'None' (Polar requires Better Auth)",
+					});
+				}
+
+				if (nextStack.backend === "convex") {
+					notes.payments.notes.push(
+						"Polar payments is not compatible with Convex backend. Payments will be set to 'None'.",
+					);
+					notes.backend.notes.push(
+						"Polar payments is not compatible with Convex backend. Payments will be disabled.",
+					);
+					notes.payments.hasIssue = true;
+					notes.backend.hasIssue = true;
+					nextStack.payments = "none";
+					changed = true;
+					changes.push({
+						category: "payments",
+						message:
+							"Payments set to 'None' (Polar not compatible with Convex backend)",
+					});
+				}
+
+				const hasWebFrontend = nextStack.webFrontend.some((f) => f !== "none");
+				if (
+					!hasWebFrontend &&
+					nextStack.nativeFrontend.some((f) => f !== "none")
+				) {
+					notes.payments.notes.push(
+						"Polar payments requires a web frontend. Payments will be set to 'None'.",
+					);
+					notes.webFrontend.notes.push(
+						"Polar payments requires a web frontend. Payments will be disabled.",
+					);
+					notes.payments.hasIssue = true;
+					notes.webFrontend.hasIssue = true;
+					nextStack.payments = "none";
+					changed = true;
+					changes.push({
+						category: "payments",
+						message: "Payments set to 'None' (Polar requires web frontend)",
+					});
+				}
+			}
+
 			const incompatibleAddons: string[] = [];
 			const isPWACompat = hasPWACompatibleFrontend(nextStack.webFrontend);
 			const isTauriCompat = hasTauriCompatibleFrontend(nextStack.webFrontend);
@@ -1536,6 +1594,22 @@ export const getDisabledReason = (
 		}
 	}
 
+	if (category === "payments" && optionId === "polar") {
+		if (finalStack.auth !== "better-auth") {
+			return "Polar payments requires Better Auth. Select Better Auth first.";
+		}
+		if (finalStack.backend === "convex") {
+			return "Polar payments is not compatible with Convex backend. Try Hono, Express, Fastify, or Elysia.";
+		}
+		const hasWebFrontend = finalStack.webFrontend.some((f) => f !== "none");
+		if (
+			!hasWebFrontend &&
+			finalStack.nativeFrontend.some((f) => f !== "none")
+		) {
+			return "Polar payments requires a web frontend. Select a web frontend first.";
+		}
+	}
+
 	if (category === "dbSetup" && optionId === "planetscale") {
 		if (finalStack.database !== "postgres" && finalStack.database !== "mysql") {
 			return "PlanetScale requires PostgreSQL or MySQL database. Select PostgreSQL or MySQL first.";

apps/web/src/lib/constant.ts

@@ -427,6 +427,24 @@ export const TECH_OPTIONS: Record<
 			color: "from-red-400 to-red-600",
 		},
 	],
+	payments: [
+		{
+			id: "polar",
+			name: "Polar",
+			description: "Turn your software into a business. 6 lines of code.",
+			icon: `${ICON_BASE_URL}/polar.svg`,
+			color: "from-purple-400 to-purple-600",
+			default: false,
+		},
+		{
+			id: "none",
+			name: "No Payments",
+			description: "Skip payments integration",
+			icon: "",
+			color: "from-gray-400 to-gray-600",
+			default: true,
+		},
+	],
 	packageManager: [
 		{
 			id: "npm",
@@ -604,6 +622,7 @@ export const PRESET_TEMPLATES = [
 			orm: "drizzle",
 			dbSetup: "none",
 			auth: "better-auth",
+			payments: "none",
 			packageManager: "bun",
 			addons: ["turborepo"],
 			examples: [],
@@ -629,6 +648,7 @@ export const PRESET_TEMPLATES = [
 			orm: "none",
 			dbSetup: "none",
 			auth: "none",
+			payments: "none",
 			packageManager: "bun",
 			addons: ["turborepo"],
 			examples: ["todo"],
@@ -654,6 +674,7 @@ export const PRESET_TEMPLATES = [
 			orm: "drizzle",
 			dbSetup: "none",
 			auth: "better-auth",
+			payments: "none",
 			packageManager: "bun",
 			addons: ["turborepo"],
 			examples: [],
@@ -679,6 +700,7 @@ export const PRESET_TEMPLATES = [
 			orm: "drizzle",
 			dbSetup: "none",
 			auth: "better-auth",
+			payments: "none",
 			packageManager: "bun",
 			addons: ["turborepo"],
 			examples: [],
@@ -704,6 +726,7 @@ export const PRESET_TEMPLATES = [
 			orm: "drizzle",
 			dbSetup: "turso",
 			auth: "better-auth",
+			payments: "polar",
 			packageManager: "bun",
 			addons: ["pwa", "biome", "husky", "tauri", "starlight", "turborepo"],
 			examples: ["todo", "ai"],
@@ -727,6 +750,7 @@ export type StackState = {
 	orm: string;
 	dbSetup: string;
 	auth: string;
+	payments: string;
 	packageManager: string;
 	addons: string[];
 	examples: string[];
@@ -748,6 +772,7 @@ export const DEFAULT_STACK: StackState = {
 	orm: "drizzle",
 	dbSetup: "none",
 	auth: "better-auth",
+	payments: "none",
 	packageManager: "bun",
 	addons: ["turborepo"],
 	examples: [],

apps/web/src/lib/stack-url-keys.ts

@@ -12,6 +12,7 @@ export const stackUrlKeys: UrlKeys<Record<keyof StackState, unknown>> = {
 	orm: "orm",
 	dbSetup: "dbs",
 	auth: "au",
+	payments: "pay",
 	packageManager: "pm",
 	addons: "add",
 	examples: "ex",

apps/web/src/lib/stack-url-state.client.ts

@@ -43,6 +43,9 @@ export const stackParsers = {
 	auth: parseAsStringEnum<StackState["auth"]>(getValidIds("auth")).withDefault(
 		DEFAULT_STACK.auth,
 	),
+	payments: parseAsStringEnum<StackState["payments"]>(
+		getValidIds("payments"),
+	).withDefault(DEFAULT_STACK.payments),
 	packageManager: parseAsStringEnum<StackState["packageManager"]>(
 		getValidIds("packageManager"),
 	).withDefault(DEFAULT_STACK.packageManager),

apps/web/src/lib/stack-url-state.ts

@@ -44,6 +44,9 @@ const serverStackParsers = {
 	auth: parseAsStringEnumServer<StackState["auth"]>(
 		getValidIds("auth"),
 	).withDefault(DEFAULT_STACK.auth),
+	payments: parseAsStringEnumServer<StackState["payments"]>(
+		getValidIds("payments"),
+	).withDefault(DEFAULT_STACK.payments),
 	packageManager: parseAsStringEnumServer<StackState["packageManager"]>(
 		getValidIds("packageManager"),
 	).withDefault(DEFAULT_STACK.packageManager),

apps/web/src/lib/stack-utils.ts

@@ -18,6 +18,7 @@ const CATEGORY_ORDER: Array<keyof typeof TECH_OPTIONS> = [
 	"webDeploy",
 	"serverDeploy",
 	"auth",
+	"payments",
 	"packageManager",
 	"addons",
 	"examples",
@@ -88,6 +89,7 @@ export function generateStackCommand(stack: StackState) {
 		`--runtime ${stack.runtime}`,
 		`--api ${stack.api}`,
 		`--auth ${stack.auth}`,
+		`--payments ${stack.payments}`,
 		`--database ${stack.database}`,
 		`--orm ${stack.orm}`,
 		`--db-setup ${stack.dbSetup}`,

apps/web/src/lib/types.ts

@@ -10,6 +10,7 @@ export type TechCategory =
 	| "webDeploy"
 	| "serverDeploy"
 	| "auth"
+	| "payments"
 	| "packageManager"
 	| "addons"
 	| "examples"