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The Heyy API uses conventional HTTP response codes to indicate success or failure. Response codes in the 2xx range indicate success. Codes in the 4xx range indicate a client error—the request failed given the information provided. Codes in the 5xx range indicate an error on Heyy’s servers.

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HTTP error codes in use

The API uses the following HTTP codes to communicate errors:
HTTP CodeError typeDescription
400Client errorReturned when there is a type mismatch in the request body, invalid fields, or other structural issues in the request.
401UnauthorizedReturned when the request could not be authenticated (e.g. missing or invalid API key).
404Not foundReturned when the requested resource does not exist.
429Too many requestsReturned when you exceed the rate limit. Throttle requests and use the rate limit headers to retry appropriately.
500Unexpected errorReturned when an unexpected problem occurs on our servers. Retry with exponential backoff.

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Error object

Every error response uses the same structure: a single error object with messageKey and message. 
{
  "error": {
    "messageKey": "contact_not_found",
    "message": "No contact could be found for this resource identifier. Please make sure to use the correct contact ID."
  }
}