Reference

Error Handling

All errors are returned as JSON with a consistent shape. Use the code field for programmatic handling.

HTTP status codes

Code	Meaning
`200`	Success
`400`	Bad Request — missing or invalid parameters
`401`	Unauthorized — missing or invalid API key
`403`	Forbidden — your key lacks the required scope
`404`	Not Found — the resource does not exist
`429`	Rate Limited — slow down and retry
`500`	Server Error — something went wrong on our end

{
  "error": "Contact not found",
  "code": "NOT_FOUND",
  "statusCode": 404
}