Reference
SIMULATE_FAILED
Payment simulation failed
Payment simulation failed
HTTP status 400 Bad Request, code SIMULATE_FAILED.
What it means#
The sandbox payment simulation could not record the payment as succeeded. The message carries the reason, usually that the payment was not found or is not pending.
What to do#
Check the payment id and status; this operation exists outside production only.
On the wire#
Every error response carrying this code names this page in error.moreInfo,
with the request id in the query string. See Error codes for
the response shape and the list of every code.