Verify an AP2 v0.2 PaymentReceipt against its signed mandate chain (Intent → Cart → Payment) and apply the Human-Not-Present (HNP) autonomy guardrail. Answers the runtime trust question AP2 v0.2 opened: "this agent paid with no human present — was the receipt valid and the autonomy authorized?" Client-side, zero-egress; emits a hash-anchored OpenChainGraph v0.4 artifact.
Runtime/post-trade — ART-62 verifies the receipt AFTER an executed payment + gates HNP autonomy. art-01 validates the mandate chain BEFORE the buy (pre-trade). AP2 v0.2 PaymentReceipt + HNP is a new primitive (FIDO Alliance, Apr 2026).
Educational verifier — not legal or payment advice · AP2 v0.2: FIDO Alliance (donated by Google Apr 2026) · Verify rules against current ap2-protocol.org primary sources
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