X402PaymentRequirements

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One acceptable payment method, as advertised by the resource server.

Field encoding follows the wire format exactly:

amount is a decimal string of atomic token units (uint256-safe).
asset and payTo are 0x-prefixed addresses; case is not normalised at this layer (the verifier MUST checksum-compare).
maxTimeoutSeconds is the max wall-clock time the client may take to produce a signed payload after receiving the 402 response.

extra is required (matching @x402/core) so that producers always provide the EIP-712 domain hint needed for signature verification. The most common shape is X402ExactEvmExtra.