PaymentEvidence is protocol-neutral settlement input. x402 v2 exact is the production adapter. A hash alone is not payment evidence.
PaymentEvidence is the normalized settlement input. Adapters map protocol-specific payloads onto it. The production adapter is x402 v2 exact. MPP mpp.settlement/1 is a supported evidence profile. AP2 is authorization evidence, not payment evidence.
Minimum settlement facts
Network (CAIP-2) and asset.
Integer or decimal amount as the protocol defines it.