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Copper Lane Payments Read-only example
Payment service
Checkout
Confirmation handler
 confirmed confirmed decline no answer before deadline already processed new, compatible evidence Payment request arrives Record pay-1001 before calling the processor Submit pay-op-1001 with the same parameters What does the available evidence establish? Payment confirmed; the shop may fulfil Record the confirmed payment outcome Confirmed decline; an explicit new attempt is possible Start another payment with a new key Another payment may exist; the first is still unknown A processor confirmation arrives separately Was this confirmation identity already processed? Duplicate evt-9001; recorded outcome unchanged Record the compatible confirmation and payment outcome
Step Decision Error
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