post https://sandbox.numeral.io/v1/incoming_payments//reject
Reject an incoming payment. Only applies to the following payments:
- Asynchronous SEPA instant incoming payments to reject: 
type=sepa_instant,direction=credit;status=pending_confirmation - SEPA direct debits incoming payments: 
type=sepa,direction=debit;status=received 
Rejecting an incoming payment updates its status to rejected.
