The chosen payment requirement from accepts array
OptionalcreCRE workflow endpoint for settlement (optional)
OptionalextensionsProtocol extensions
Scheme-specific payment data
OptionalresourceInformation about the protected resource (optional, echo from PaymentRequired)
OptionaltypedEIP-712 typed data used for signature (for verification)
x402 protocol version
Payment payload created by client (v2) Spec compliance: x402 v2 - PaymentPayload Schema