X402 Payee Verification via vet402 Gateway

By TakeshiTGAL

Verify an x402 payee before authorizing payment by querying the vet402 gateway tools. Calls getResourceDecision first; if not found, calls getPayeeScore. Returns a structured decision (proceed or refuse) with reason codes extracted verbatim from API responses, evidence, and a one-sentence explanation. Refuses unless vet402 returns ALLOW; treats 404, errors, and degraded readings as refusal.