{
  "protected": {
    "alg": "RS256",
    "kid": "thainotary-agent-2026",
    "typ": "JWT"
  },
  "payload": {
    "iss": "https://xn--82czbx2bczd4fl8a.online",
    "sub": "agent-client-abc123",
    "aud": "ChatGPT/gpt-5",
    "iat": 1748707200,
    "exp": 1780243200,
    "jti": "RFD-2026-000042",
    "refund": {
      "caseId": "DSP-2026-000017",
      "amountTHB": 1500,
      "channel": "promptpay",
      "txRef": "PP-20260531-9F2A",
      "originalReceiptJti": "RCT-2026-001234",
      "reason": "sla-breach",
      "percent": 30
    }
  },
  "signature": "<base64url RS256 signature>"
}