Attribute revenue with Polar Checkout API

Before proceeding, confirm that you have linked your Polar account.

Flowsery routes Polar events by reading metadata.website_id.

const result = await polar.checkouts.create({
  products: [...],
  metadata: {
    website_id: 'flid_******',
  },
});

Supported Polar webhook events

• checkout.updated
• subscription.updated
• order.refunded

When the Polar payload contains customer.email, Flowsery can use it for attribution matching.