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.
account_closed, non_sufficient_funds, customer_requested, legal_decision, customer_no_response, returned_previously, narrative, per_agent_request, other "customer_no_response"
Accompanying free text explanation for the reason.
140Intentionally empty - return request will be rejected asynchronously.