feat: add Polar support for Convex-backed Better Auth projects with CLI integration

README.md

@@ -298,11 +298,11 @@ If Better Fullstack saves you time, consider supporting:
   <tr>
     <td align="center">
       <a href="https://github.com/Divith123">
-        <img src="https://avatars.githubusercontent.com/u/106373840?v=4" width="80" style="border-radius:50%" alt="Divith123"/>
-        <br /><sub><b>Divith S</b></sub>
-        <br /><sub>Version channels, builder parity</sub>
-        <br /><sub><a href="https://github.com/Marve10s/Better-Fullstack/pull/104">#104</a></sub>
-        <br /><sub><code>+1,072</code> <code>−139</code></sub>
+      <img src="https://avatars.githubusercontent.com/u/106373840?v=4" width="80" style="border-radius:50%" alt="Divith123"/>
+      <br /><sub><b>Divith S</b></sub>
+      <br /><sub>Version channels, builder parity</sub>
+      <br /><sub><a href="https://github.com/Marve10s/Better-Fullstack/pull/104">#104</a></sub>
+      <br /><sub><code>+1,072</code> <code>−139</code></sub>
       </a>
     </td>
     <td align="center">

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

@@ -109,7 +109,7 @@ export async function displayPostInstallInstructions(
     config.auth === "clerk" ? getClerkInstructions(config.backend, config.frontend ?? []) : "";
   const polarInstructions =
     config.payments === "polar" && config.auth === "better-auth"
-      ? getPolarInstructions(backend)
+      ? getPolarInstructions(backend, packageManager)
       : "";
   const alchemyDeployInstructions = getAlchemyDeployInstructions(
     runCmd,
@@ -447,7 +447,21 @@ function getBetterAuthConvexInstructions(hasWeb: boolean, webPort: string, packa
   );
 }
 
-function getPolarInstructions(backend: Backend) {
+function getPolarInstructions(backend: Backend, packageManager: string) {
+  if (backend === "convex") {
+    const cmd = packageManager === "npm" ? "npx" : packageManager;
+    return (
+      `${pc.bold("Polar Payments Setup:")}\n` +
+      `${pc.cyan("•")} Create a Polar organization token, webhook secret, and product in ${pc.underline("https://sandbox.polar.sh/")}\n` +
+      `${pc.cyan("•")} Set the Convex env vars from ${pc.white("packages/backend")}:\n` +
+      `${pc.white("   cd packages/backend")}\n` +
+      `${pc.white(`   ${cmd} convex env set POLAR_ORGANIZATION_TOKEN=your_polar_token`)}\n` +
+      `${pc.white(`   ${cmd} convex env set POLAR_WEBHOOK_SECRET=your_polar_webhook_secret`)}\n` +
+      `${pc.white(`   ${cmd} convex env set POLAR_PRODUCT_ID_PRO=your_polar_product_id`)}\n` +
+      `${pc.white("   Optional: set POLAR_SERVER=production when you go live")}\n` +
+      `${pc.cyan("•")} Configure a Polar webhook to ${pc.white("https://<your-convex-site-url>/polar/events")}`
+    );
+  }
   const envPath = backend === "self" ? "apps/web/.env" : "apps/server/.env";
   return `${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 ${envPath}`;
 }

apps/cli/src/prompts/payments.ts

@@ -17,11 +17,8 @@ export async function getPaymentsChoice(
     return "none" as Payments;
   }
 
-  // Polar requires better-auth and non-convex backend
   const isPolarCompatible =
-    auth === "better-auth" &&
-    backend !== "convex" &&
-    (frontends?.length === 0 || splitFrontends(frontends).web.length > 0);
+    auth === "better-auth" && (frontends?.length === 0 || splitFrontends(frontends).web.length > 0);
 
   const options: Array<{ value: Payments; label: string; hint: string }> = [];
 

apps/cli/test/auth.test.ts

@@ -187,6 +187,77 @@ describe("Authentication Configurations", () => {
       expectSuccess(result);
     });
 
+    it("should scaffold Convex Better Auth with Polar payments", async () => {
+      const result = await runTRPCTest({
+        projectName: "better-auth-convex-polar",
+        auth: "better-auth",
+        payments: "polar",
+        backend: "convex",
+        runtime: "none",
+        database: "none",
+        orm: "none",
+        api: "none",
+        frontend: ["tanstack-router"],
+        addons: ["turborepo"],
+        examples: ["none"],
+        dbSetup: "none",
+        webDeploy: "none",
+        serverDeploy: "none",
+        install: false,
+      });
+
+      expectSuccess(result);
+      if (!result.projectDir) {
+        throw new Error("Expected projectDir to be defined");
+      }
+
+      const convexConfigFile = await readFile(
+        join(result.projectDir, "packages/backend/convex/convex.config.ts"),
+        "utf8",
+      );
+      const httpFile = await readFile(
+        join(result.projectDir, "packages/backend/convex/http.ts"),
+        "utf8",
+      );
+      const polarFile = await readFile(
+        join(result.projectDir, "packages/backend/convex/polar.ts"),
+        "utf8",
+      );
+      const dashboardFile = await readFile(
+        join(result.projectDir, "apps/web/src/routes/dashboard.tsx"),
+        "utf8",
+      );
+      const backendPackageFile = await readFile(
+        join(result.projectDir, "packages/backend/package.json"),
+        "utf8",
+      );
+      const webPackageFile = await readFile(
+        join(result.projectDir, "apps/web/package.json"),
+        "utf8",
+      );
+      const convexEnvFile = await readFile(
+        join(result.projectDir, "packages/backend/.env.local"),
+        "utf8",
+      );
+
+      expect(convexConfigFile).toContain('import polar from "@convex-dev/polar/convex.config";');
+      expect(convexConfigFile).toContain("app.use(polar);");
+      expect(httpFile).toContain('import { polar } from "./polar";');
+      expect(httpFile).toContain("polar.registerRoutes(http as any);");
+      expect(polarFile).toContain('import { Polar } from "@convex-dev/polar";');
+      expect(polarFile).toContain("POLAR_PRODUCT_ID_PRO");
+      expect(dashboardFile).toContain('from "@convex-dev/polar/react";');
+      expect(dashboardFile).toContain("api.polar.getConfiguredProducts");
+      expect(dashboardFile).toContain("api.polar.getCurrentSubscription");
+      expect(backendPackageFile).toContain('"@convex-dev/polar"');
+      expect(backendPackageFile).toContain('"@polar-sh/sdk"');
+      expect(webPackageFile).toContain('"@convex-dev/polar"');
+      expect(webPackageFile).toContain('"@polar-sh/checkout"');
+      expect(convexEnvFile).toContain("# npx convex env set POLAR_ORGANIZATION_TOKEN");
+      expect(convexEnvFile).toContain("# npx convex env set POLAR_PRODUCT_ID_PRO");
+      expect(convexEnvFile).toContain("POLAR_SERVER=sandbox");
+    });
+
     const compatibleFrontends = [
       "react-vite",
       "tanstack-router",

packages/template-generator/src/processors/env-vars.ts

@@ -460,6 +460,7 @@ function buildNativeVars(
 function buildConvexBackendVars(
   frontend: string[],
   auth: ProjectConfig["auth"],
+  payments: ProjectConfig["payments"],
   examples: ProjectConfig["examples"],
 ): EnvVariable[] {
   const hasNextJs = frontend.includes("next");
@@ -516,12 +517,42 @@ function buildConvexBackendVars(
     }
   }
 
+  if (payments === "polar") {
+    vars.push(
+      {
+        key: "POLAR_ORGANIZATION_TOKEN",
+        value: "",
+        condition: true,
+        comment: "Polar organization token",
+      },
+      {
+        key: "POLAR_WEBHOOK_SECRET",
+        value: "",
+        condition: true,
+        comment: "Polar webhook secret",
+      },
+      {
+        key: "POLAR_PRODUCT_ID_PRO",
+        value: "",
+        condition: true,
+        comment: "Polar product ID for the default Pro plan",
+      },
+      {
+        key: "POLAR_SERVER",
+        value: "sandbox",
+        condition: true,
+        comment: "Polar environment: sandbox or production",
+      },
+    );
+  }
+
   return vars;
 }
 
 function buildConvexCommentBlocks(
   frontend: string[],
   auth: ProjectConfig["auth"],
+  payments: ProjectConfig["payments"],
   examples: ProjectConfig["examples"],
 ): string {
   const hasWeb =
@@ -549,6 +580,18 @@ function buildConvexCommentBlocks(
 ${hasWeb ? "# npx convex env set SITE_URL http://localhost:3001\n" : ""}`;
   }
 
+  if (payments === "polar") {
+    commentBlocks += `# Set Polar environment variables
+# npx convex env set POLAR_ORGANIZATION_TOKEN=your_polar_token
+# npx convex env set POLAR_WEBHOOK_SECRET=your_polar_webhook_secret
+# npx convex env set POLAR_PRODUCT_ID_PRO=your_polar_product_id
+# Optional: npx convex env set POLAR_SERVER=sandbox
+# Create a Polar webhook at https://<your-convex-site-url>/polar/events
+# Enable: product.created, product.updated, subscription.created, subscription.updated
+
+`;
+  }
+
   return commentBlocks;
 }
 
@@ -1440,7 +1483,7 @@ export function processEnvVariables(vfs: VirtualFileSystem, config: ProjectConfi
       const envLocalPath = `${convexBackendDir}/.env.local`;
 
       // Write comment blocks first
-      const commentBlocks = buildConvexCommentBlocks(frontend, auth, examples);
+      const commentBlocks = buildConvexCommentBlocks(frontend, auth, payments, examples);
       if (commentBlocks) {
         let currentContent = "";
         if (vfs.exists(envLocalPath)) {
@@ -1450,7 +1493,7 @@ export function processEnvVariables(vfs: VirtualFileSystem, config: ProjectConfi
       }
 
       // Then add variables
-      const convexBackendVars = buildConvexBackendVars(frontend, auth, examples);
+      const convexBackendVars = buildConvexBackendVars(frontend, auth, payments, examples);
       if (convexBackendVars.length > 0) {
         let existingContent = "";
         if (vfs.exists(envLocalPath)) {

packages/template-generator/src/processors/payments-deps.ts

@@ -25,11 +25,37 @@ export function processPaymentsDeps(vfs: VirtualFileSystem, config: ProjectConfi
   const { payments, frontend, backend } = config;
   if (!payments || payments === "none") return;
 
+  const backendPath = "packages/backend/package.json";
   const authPath = "packages/auth/package.json";
   const webPath = getWebPackagePath(frontend, backend);
   const serverPath = getServerPackagePath(frontend, backend);
 
   if (payments === "polar") {
+    if (backend === "convex") {
+      if (vfs.exists(backendPath)) {
+        addPackageDependency({
+          vfs,
+          packagePath: backendPath,
+          dependencies: ["@convex-dev/polar", "@polar-sh/sdk"],
+        });
+      }
+
+      if (vfs.exists(webPath)) {
+        const hasReactWebFrontend = frontend.some((f) =>
+          ["react-router", "tanstack-router", "tanstack-start", "next"].includes(f),
+        );
+        if (hasReactWebFrontend) {
+          addPackageDependency({
+            vfs,
+            packagePath: webPath,
+            dependencies: ["@convex-dev/polar", "@polar-sh/checkout"],
+          });
+        }
+      }
+
+      return;
+    }
+
     if (vfs.exists(authPath)) {
       addPackageDependency({
         vfs,

packages/template-generator/src/template-handlers/payments.ts

@@ -10,7 +10,6 @@ export async function processPaymentsTemplates(
   config: ProjectConfig,
 ): Promise<void> {
   if (!config.payments || config.payments === "none") return;
-  if (config.backend === "convex") return;
 
   const hasReactWeb = config.frontend.some((f) =>
     ["tanstack-router", "react-router", "react-vite", "tanstack-start", "next"].includes(f),
@@ -19,7 +18,15 @@ export async function processPaymentsTemplates(
   const hasSvelteWeb = config.frontend.includes("svelte");
   const hasSolidWeb = config.frontend.includes("solid");
 
-  if (config.backend !== "none") {
+  if (config.backend === "convex") {
+    processTemplatesFromPrefix(
+      vfs,
+      templates,
+      `payments/${config.payments}/convex/backend`,
+      "packages/backend",
+      config,
+    );
+  } else if (config.backend !== "none") {
     processTemplatesFromPrefix(
       vfs,
       templates,
@@ -43,6 +50,15 @@ export async function processPaymentsTemplates(
         "apps/web",
         config,
       );
+      if (config.backend === "convex") {
+        processTemplatesFromPrefix(
+          vfs,
+          templates,
+          `payments/${config.payments}/convex/web/react/${reactFramework}`,
+          "apps/web",
+          config,
+        );
+      }
     }
   } else if (hasNuxtWeb) {
     processTemplatesFromPrefix(

packages/template-generator/src/utils/add-deps.ts

@@ -228,6 +228,7 @@ export const dependencyVersionMap = {
   convex: "^1.34.1",
   "@convex-dev/react-query": "^0.1.0",
   "@convex-dev/agent": "^0.6.1",
+  "@convex-dev/polar": "^0.9.0",
   "convex-svelte": "^0.0.12",
   "convex-nuxt": "0.1.5",
   "convex-vue": "^0.1.5",
@@ -306,6 +307,7 @@ export const dependencyVersionMap = {
   srvx: "^0.11.13",
 
   "@polar-sh/better-auth": "^1.8.3",
+  "@polar-sh/checkout": "^0.2.0",
   "@polar-sh/sdk": "^0.46.7",
 
   // Email

packages/template-generator/templates/auth/better-auth/convex/backend/convex/http.ts.hbs

@@ -1,12 +1,20 @@
 import { httpRouter } from "convex/server";
 import { authComponent, createAuth } from "./auth";
 
+{{#if (eq payments "polar")}}
+import { polar } from "./polar";
+{{/if}}
+
 const http = httpRouter();
 
 {{#if (or (includes frontend "tanstack-router") (includes frontend "react-router") (includes frontend "nuxt") (includes frontend "svelte") (includes frontend "solid"))}}
 authComponent.registerRoutes(http, createAuth, { cors: true });
 {{else}}
 authComponent.registerRoutes(http, createAuth);
 {{/if}}
+{{#if (eq payments "polar")}}
+
+polar.registerRoutes(http as any);
+{{/if}}
 
 export default http;