Permit signature data from createPermitSignature
Token owner address
Approved spender address
Token amount in base units
Unix timestamp for permit expiry
Recovery parameter from signature
Signature r component (32 bytes hex)
Signature s component (32 bytes hex)
Full hex-encoded permit signature
CAIP-2 network identifier (e.g., "eip155:8453")
Gas sponsor payload ready for header encoding
Creates a gas sponsor payload from permit data and network.