Attribute revenue with Polar Checkout API

  • Pass metadata with
    insightly_visitor_id
    and
    insightly_session_id
    (cookies from DataFast) when creating a checkout session:
    • // app/api/create-checkout/route.js
import { cookies } from 'next/headers';

export async function POST() {
  const cookieStore = cookies();
  // If you're using Next.js 15+, use this instead:
  // const cookieStore = await cookies();
  
  const result = await polar.checkouts.create({
    products: [...],
    metadata: {
      insightly_visitor_id: cookieStore.get('insightly_visitor_id')?.value,
      insightly_session_id: cookieStore.get('insightly_session_id')?.value,
    },
  });
}

    Once connected and metadata is properly passed, DataFast will automatically attribute revenue to the correct marketing channels. No webhook setup is required.