Proof of Payment

Overview

Proof of payment is evidence that a payer initiated or completed a payment-related action, such as a receipt, bank confirmation, provider record, or blockchain transaction. Its reliability depends on the source and status, and it does not automatically prove final settlement or correct matching.

The source-of-truth record should preserve order or obligation, payment identifier, participants, amount, currency or asset, route, provider evidence, and ledger effect for Proof of Payment, including the handoff to 24/7 Payment . The operating record should preserve the original obligation, participants, amount, currency or asset, authoritative identifiers, timestamps, state history, exceptions, and final financial effect.

Proof of Payment should remain distinct from 24/7 Payment and Payment Evidence, because each can represent a different stage, record, control, or financial outcome.

For Proof of Payment, the most consequential risks are ambiguous states, stale events, wrong payment matching , premature fulfillment, confirmation assumptions, late success after expiry, unsupported manual transitions, contradictory evidence, and customer messages that overstate finality. Important failure modes include duplicate or delayed events, wrong destinations or currencies, stale instructions, unavailable providers, unsupported retries, and customer-facing status that differs from authoritative records.

Controls should validate inputs server-side, authenticate external events, make irreversible actions idempotent, and reconcile provider, network, settlement, and ledger evidence. For Proof of Payment, the authoritative record and completion rule should be documented before any irreversible operational, customer, or accounting action is released. Teams using Proof of Payment should preserve the evidence behind each decision so retries, corrections, support reviews, and audits can reproduce the final outcome.