Implement ISO 20022 camt.056 payment cancellation request and handle camt.029 resolution of investigation response

Steps

1. Identify the original pacs.008 instruction via its EndToEndId or InstrId; retrieve the original transaction reference from your payment records
2. Construct a camt.056 FIToFI Payment Cancellation Request XML message with the original group header reference, the cancellation reason code (e.g., DUPL for duplicate, FRAD for fraud), and the original instruction identification fields
3. Submit the camt.056 to your correspondent bank's ISO 20022 channel (FileAct or API endpoint) and record the CancellationId for tracking
4. Await the camt.029 Resolution of Investigation message from the receiving bank; parse the Status field — CNCL (cancelled), RJCR (rejected), or PDCR (pending) — and update your payment record
5. If RJCR is received, parse the RejectionReason element for the specific code (e.g., NOAS for no original transaction found) and escalate to manual investigation
6. Implement a timeout handler: if no camt.029 is received within the agreed SLA window, escalate the investigation to your correspondent bank's operations team via a separate channel