Simulate an incoming instant payment return request rejection.
Bearer authentication header of the form Bearer <token>, where <token> is your auth token.
ID of the instant payment object whose return request you want to reject.
^instant_payment_\w+$The reason for rejecting the return request.
closed_account, insufficient_funds, customer_decision, legal_decision, no_answer_from_customer, already_returned, narrative, other "customer_decision"
Accompanying free text explanation for the reason.
Incoming instant payment return request rejection object created.
The response is of type object.