Monetization

Billing & License Fulfillment

Polar.sh Merchant of Record integration, checkout sessions, and webhook automation.

Checkouts are handled by Polar.sh, acting as the Merchant of Record for EU VAT calculation, invoicing, and global compliance.

src/routes/api/checkout/+server.ts

const checkout = await polar.checkouts.create({
  products: [productId],
  successUrl: `${origin}/welcome?checkout_id={CHECKOUT_ID}`,
  customerEmail: locals.user?.email,
  metadata: { userId: locals.user?.id }
});

Cryptographic Webhook Fulfillment

The webhook handler verifies incoming Polar signatures via HMAC, upserts the customer and purchase records, generates a unique license key, and triggers transactional fulfillment emails.

Database & Drizzle ORM

Type-Safe Hono RPC