2021: Payment request not found

No payment request with that ID exists on your account. This is an HTTP 404 error.

• Verify the ID against GET /v3/payment_requests — it is the id from the create response, not the Stripe checkout session
• A payment request belonging to another account returns this same 404 rather than a 403, so it never reveals whether the ID exists elsewhere

• Sending Payment Links
• API reference: Payment Requests
• Error Codes