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Blip 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 Blip's servers (these are rare). Some 4xx errors that could be handled programmatically include an error code that briefly explains the error reported.

200 OK - Everything worked as expected.
401 Unauthorized - The API key provided was invalid.
402 Request Failed - The request was unacceptable.
403 Forbidden - The API key does not have permissions to access the resource.
404 Not Found - The requested resource does not exist.
429 Too Many Requests - Too many requests hit the API too quickly.
500, 502, 503, 504 Server Error - Something went wrong with Blip's server.