Void an existing payment.

Void a bill payment that has started processing and cannot be canceled (with POST /v3/payments/{paymentId}/cancel). You can attempt to void payments made both with BILL (online) and outside BILL (offline).

Void a payment made with BILL (online)

In your /POST /v3/payments/{paymentId}/void request:

• Set paymentId as the BILL-generated ID of the payment. The value begins with stp.
• Set type as the void payment request type
• Set reason as the reason for voiding the payment

See Can 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.