Writer uses conventional HTTP response codes to indicate the success or failure of an API request. In general:

  • Codes in the 2xx range indicate success.
  • Codes in the 4xx range indicate an error that failed given the information provided (e.g., a required parameter was omitted, a charge failed, etc.).
  • Codes in the 5xx range indicate an error with Writer's servers (these are rare).
  • Some 4xx errors that could be handled programmatically (e.g., a request is declined) include an error code that briefly explains the error reported.