Session Already Processed

Indicates the checkout has already been processed. Check the transaction status by calling our get transaction endpoint.

Common Causes

• The checkout has already completed successfully.
• A duplicate processing request is sent for the same checkout.
• A retry occurs after the transaction has already been captured.

{
  "type": "https://developer.sumup.com/docs/problem/session-already-processed/",
  "title": "Conflict",
  "status": 409,
  "detail": "The checkout session ae98b9cc-2287-4621-afa1-d36ae2ea219d is already processed",
  "instance": "1bfe72b34387"
}