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Errors are returned in a normalized JSON envelope: 
{
  "error": { "code": "RATE_LIMITED", "message": "Too many requests" }
}
Common codes:
  • AUTH_INVALID_KEY (401): Invalid or missing API key
  • AUTH_NOT_CONFIGURED (503): API auth is not configured on the server
  • AUTH_UNAVAILABLE (503): Temporary issue validating API keys
  • RATE_LIMITED (429): Per-key rate limit exceeded
  • FILE_REQUIRED (400): Missing multipart file field
  • INVALID_IDS (400): Missing or empty ids[] in a convert request
  • PASSWORD_REQUIRED (400): Missing password in body
  • NOT_FOUND (404): Job not found (expired or invalid jobId)
  • NOT_READY (409): Job exists but is not completed yet
  • UPLOAD_UNEXPECTED (502): Upload succeeded upstream, but the response could not be parsed
  • UPLOAD_FAILED, CONVERT_FAILED, SET_PASSWORD_FAILED (502): Processing or upstream error (check error.details.reason)