Void a bill payment that has started processing and cannot be canceled (with /v2/CancelAPPayment.json). You can attempt to void payments made both with BILL (online) and outside BILL (offline).

Void a payment made with BILL (online)

In your /v2/VoidAPPayment.json request:

• Set sentPayId as the BILL-generated ID of the SentPay payment object. The value begins with stp.
• Set voidRequestType as the void bill payment request type.
• Set reason as the reason for voiding the payment.

In the sandbox environment, the payment status is marked as Void.

See How do I cancel or void a Payables payment? in the BILL Help Center to learn about the BILL void payment process and timing in the production environment.