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Error response shape: 
{
  "error": "message"
}
Common status codes:
  • 400 invalid request
  • 401 missing/invalid bearer token
  • 403 missing scope
  • 404 resource not found
  • 409 idempotency conflict
  • 422 plan/validation limits
  • 429 rate limited
  • 500 provider/internal failure
Use idempotency keys and exponential backoff for retryable failures.