Convex Polar Component

Add subscriptions and billing to your Convex app with Polar.

Check out the example app for a complete example.

// Get subscription details for the current user
const {
  productKey,
  status,
  currentPeriodEnd,
  currentPeriodStart,
  ...
} = await polar.getCurrentSubscription(ctx, {
  userId: user._id,
});

// Show available plans
<CheckoutLink
  polarApi={api.example}
  productIds={[products.premiumMonthly.id, products.premiumYearly.id]}
  // Optional: turn off embedding to link to a checkout page
  embed={false}
>
  Upgrade to Premium
</CheckoutLink>

// Manage existing subscriptions
<CustomerPortalLink polarApi={api.example}>
  Manage Subscription
</CustomerPortalLink>

Prerequisites

Convex App

You'll need a Convex App to use the component. Follow any of the Convex quickstarts to set one up.

Polar Account

• Create a Polar account
• Create an organization and generate an organization token with permissions:
  • products:read
  • products:write
  • subscriptions:read
  • subscriptions:write
  • customers:read
  • customers:write
  • checkouts:read
  • checkouts:write
  • checkout_links:read
  • checkout_links:write
  • customer_portal:read
  • customer_portal:write
  • customer_sessions:write

Installation

Install the component package:

npm install @convex-dev/polar

Create a convex.config.ts file in your app's convex/ folder and install the component by calling app.use:

// convex/convex.config.ts
import { defineApp } from "convex/server";
import polar from "@convex-dev/polar/convex.config";

const app = defineApp();
app.use(polar);

export default app;

Set your Polar organization token:

npx convex env set POLAR_ORGANIZATION_TOKEN xxxxx

Usage

Set up Polar webhooks

The Polar component uses webhooks to keep subscription data in sync. You'll need to:

1. Create a webhook and webhook secret in the Polar dashboard, using your Convex site URL + /polar/events as the webhook endpoint. It should look like this: https://verb-noun-123.convex.cloud/polar/events

   Enable the following events:

   • product.created
   • product.updated
   • subscription.created
   • subscription.updated

2. Set the webhook secret in your Convex environment:

npx convex env set POLAR_WEBHOOK_SECRET xxxxx

3. Register the webhook handler in your convex/http.ts:

import { httpRouter } from "convex/server";
import { polar } from "./example";

const http = httpRouter();

// Register the webhook handler at /polar/events
polar.registerRoutes(http as any);

export default http;

You can also provide callbacks for webhook events:

polar.registerRoutes(http, {
  // Optional custom path, default is "/events/polar"
  path: "/events/polar",
  // Optional callbacks for webhook events
  onSubscriptionUpdated: async (ctx, event) => {
    // Handle subscription updates, like cancellations.
    // Note that a cancelled subscription will not be deleted from the database,
    // so this information remains available without a hook, eg., via
    // `getCurrentSubscription()`.
    if (event.data.customerCancellationReason) {
      console.log("Customer cancelled:", event.data.customerCancellationReason);
    }
  },
  onSubscriptionCreated: async (ctx, event) => {
    // Handle new subscriptions
  },
  onProductCreated: async (ctx, event) => {
    // Handle new products
  },
  onProductUpdated: async (ctx, event) => {
    // Handle product updates
  },
});

4. Be sure to run npx convex dev to start your Convex app with the Polar component enabled, which will deploy the webhook handler to your Convex instance.

Create products in Polar

Create a product in the Polar dashboard for each pricing plan that you want to offer. The product data will be synced to your Convex app automatically.

Note: You can have one price per plan, so a plan with monthly and yearly pricing requires two products in Polar.

Note: The Convex Polar component is currently built to support recurring subscriptions, and may not work as expected with one-time payments. Please open an issue or reach out on Discord if you run into any issues.

Initialize the Polar client

Create a Polar client in your Convex backend:

// convex/example.ts
import { Polar } from "@convex-dev/polar";
import { api, components } from "./_generated/api";
import { DataModel } from "./_generated/dataModel";

export const polar = new Polar(components.polar, {
  // Required: provide a function the component can use to get the current user's ID and
  // email - this will be used for retrieving the correct subscription data for the
  // current user. The function should return an object with `userId` and `email`
  // properties.
  getUserInfo: async (ctx) => {
    const user = await ctx.runQuery(api.example.getCurrentUser);
    return {
      userId: user._id,
      email: user.email,
    };
  },
  // Optional: Configure static keys for referencing your products.
  // Alternatively you can use the `listAllProducts` function to get
  // the product data and sort it out in your UI however you like
  // (eg., by price, name, recurrence, etc.).
  // Map your product keys to Polar product IDs (you can also use env vars for this)
  // Replace these keys with whatever is useful for your app (eg., "pro", "proMonthly",
  // whatever you want), and replace the values with the actual product IDs from your
  // Polar dashboard
  products: {
    premiumMonthly: "product_id_from_polar",
    premiumYearly: "product_id_from_polar",
    premiumPlusMonthly: "product_id_from_polar",
    premiumPlusYearly: "product_id_from_polar",
  },
  // Optional: Set Polar configuration directly in code
  organizationToken: "your_organization_token", // Defaults to POLAR_ORGANIZATION_TOKEN env var
  webhookSecret: "your_webhook_secret", // Defaults to POLAR_WEBHOOK_SECRET env var
  server: "sandbox", // Optional: "sandbox" or "production", defaults to POLAR_SERVER env var
});

// Export API functions from the Polar client
export const {
  changeCurrentSubscription,
  cancelCurrentSubscription,
  getConfiguredProducts,
  listAllProducts,
  generateCheckoutLink,
  generateCustomerPortalUrl,
} = polar.api();

Display products and prices

Use the exported getConfiguredProducts or listAllProductsfunction to display your products and their prices:

getConfiguredProducts

// Simple example of displaying products and prices if you've configured
// products by key in the Polar constructor
function PricingTable() {
  const products = useQuery(api.example.getConfiguredProducts);
  if (!products) return null;

  return (
    <div>
      {products.premiumMonthly && (
        <div>
          <h3>{products.premiumMonthly.name}</h3>
          <p>
            ${(products.premiumMonthly.prices[0].priceAmount ?? 0) / 100}/month
          </p>
        </div>
      )}
      {products.premiumYearly && (
        <div>
          <h3>{products.premiumYearly.name}</h3>
          <p>
            ${(products.premiumYearly.prices[0].priceAmount ?? 0) / 100}/year
          </p>
        </div>
      )}
    </div>
  );
}

listAllProducts

// Simple example of displaying products and prices if you haven't configured
// products by key in the Polar constructor
function PricingTable() {
  const products = useQuery(api.example.listAllProducts);
  if (!products) return null;

  // You can sort through products in the client as below, or you can use
  // `polar.listAllProducts` in your own Convex query and return your desired
  // products to display in the UI.
  const proMonthly = products.find(
    (p) => p.prices[0].recurringInterval === "month"
  );
  const proYearly = products.find(
    (p) => p.prices[0].recurringInterval === "year"
  );
  return (
    <div>
      {proMonthly && (
        <div>
          <h3>{proMonthly.name}</h3>
          <p>
            ${(proMonthly.prices[0].priceAmount ?? 0) / 100}/
            {proMonthly.prices[0].recurringInterval}
          </p>
        </div>
      )}
      {proYearly && (
        <div>
          <h3>{proYearly.name}</h3>
          <p>${(proYearly.prices[0].priceAmount ?? 0) / 100}/year</p>
        </div>
      )}
    </div>
  );
}

Each product includes:

• id: The Polar product ID
• name: The product name
• prices: Array of prices with:
  • priceAmount: Price in cents
  • priceCurrency: Currency code (e.g., "USD")
  • recurringInterval: "month" or "year"

Add subscription UI components

Use the provided React components to add subscription functionality to your app:

import { CheckoutLink, CustomerPortalLink } from "@convex-dev/polar/react";
import { api } from "../convex/_generated/api";

// For new subscriptions
<CheckoutLink
  // For our example, the api.example object includes the generateCheckoutLink
  // function. You can also pass any object that includes this function.
  polarApi={api.example}
  productIds={[products.premiumMonthly.id, products.premiumYearly.id]}
  // Optional: turn off embedding to link to a checkout page
  embed={false}
>
  Upgrade to Premium
</CheckoutLink>

// For managing existing subscriptions
<CustomerPortalLink
  polarApi={{
    generateCustomerPortalUrl: api.example.generateCustomerPortalUrl,
  }}
>
  Manage Subscription
</CustomerPortalLink>

Handle subscription changes

The Polar component provides functions to handle subscription changes for the current user.

Note: It is highly recommended to prompt the user for confirmation before changing their subscription this way!

// Change subscription
const changeSubscription = useAction(api.example.changeCurrentSubscription);
await changeSubscription({ productId: "new_product_id" });

// Cancel subscription
const cancelSubscription = useAction(api.example.cancelCurrentSubscription);
await cancelSubscription({ revokeImmediately: true });

Access subscription data

Query subscription information in your app:

// convex/example.ts

// A query that returns a user with their subscription details
export const getCurrentUser = query({
  handler: async (ctx) => {
    const user = await ctx.db.query("users").first();
    if (!user) throw new Error("No user found");

    const subscription = await polar.getCurrentSubscription(ctx, {
      userId: user._id,
    });

    return {
      ...user,
      subscription,
      isFree: !subscription,
      isPremium:
        subscription?.productKey === "premiumMonthly" ||
        subscription?.productKey === "premiumYearly",
    };
  },
});

API Reference

Polar Client

The Polar class accepts a configuration object with:

• getUserInfo: Function to get the current user's ID and email
• products: (Optional) Map of arbitrarily named keys to Polar product IDs
• organizationToken: (Optional) Your Polar organization token. Falls back to POLAR_ORGANIZATION_TOKEN env var
• webhookSecret: (Optional) Your Polar webhook secret. Falls back to POLAR_WEBHOOK_SECRET env var
• server: (Optional) Polar server environment: "sandbox" or "production". Falls back to POLAR_SERVER env var

React Components

CheckoutLink

Props:

• polarApi: Object containing generateCheckoutLink function
• productIds: Array of product IDs to show in the checkout
• children: React children (button content)
• embed: (Optional) Whether to embed the checkout link. Defaults to true.
• className: (Optional) CSS class name

CustomerPortalLink

Props:

• polarApi: Object containing generateCustomerPortalUrl function
• children: React children (button content)
• className: (Optional) CSS class name

API Functions

changeCurrentSubscription

Change an existing subscription to a new plan:

await changeSubscription({ productId: "new_product_id" });

cancelCurrentSubscription

Cancel an existing subscription:

await cancelSubscription({ revokeImmediately: true });

getCurrentSubscription

Get the current user's subscription details:

const subscription = await polar.getCurrentSubscription(ctx, { userId });

getProducts

List all available products and their prices:

const products = await polar.listProducts(ctx);

registerRoutes

Register webhook handlers for the Polar component:

polar.registerRoutes(http, {
  // Optional: customize the webhook endpoint path (defaults to "/polar/events")
  path: "/custom/webhook/path",
});

The webhook handler uses the webhookSecret from the Polar client configuration or the POLAR_WEBHOOK_SECRET environment variable.