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Plain textAmbiguous Payment Recovery Self-TestSeven questions with YES / NO / UNSURE scoring and the verdict vocabulary, ready to fill in during a review.Download →Plain textCross-System Payment Proof CardThe four systems that must agree, the evidence fields to collect per attempt, and the rules for each verdict.Download →Machine-readable JSONSample JSON proofA complete sandbox proof record: intent binding, attempt counts, observations, receipt integrity, and verdict.Download →
What to do next
- 1. Run the seven-question self-test against one real payout or transfer path — not the whole platform.
- 2. Mark each of the four systems (provider, external rail, recipient, customer ledger) as independently observable or not.
- 3. Decide which verdict your current evidence can actually support after a timeout, and where blind retry is still possible.
- 4. Compare your evidence shape with the sample JSON proof and the public repository.
Reminder: these materials describe a method and a sandbox result. They do not process payments, and the sandbox numbers prove only the declared sandbox boundary, not universal exactly-once execution.