API error responses

> **Note**\ > The following error codes are commonly returned by Blueshift APIs. Depending on the specific endpoint, not all may apply.

Status code	Description	Example responses
400 Bad Request	The request is invalid due to missing or incorrect parameters. This includes missing fields, invalid values, formatting issues, or conflicts such as duplicate data.	`{ "errors": { "name": ["can't be blank"] } }` `{ "errors": { "startdate": ["can't be blank"] } }`
401 Unauthorized	API authentication failed due to an invalid or missing API key.	`{ "message": "Not authorized" }`
403 Forbidden	The API key does not have sufficient permissions to perform this action.	`{ "message": "Permission denied" }`
404 Not Found	The specified campaign was not found. Verify the campaign UUID.	`{ "message": "Campaign not found" }`
422 Unprocessable Entity	* The campaign cannot be paused due to its current status (e.g., already completed or archived). * One or more scheduling parameters may be invalid (if applicable).	`{ "message": "Campaign cannot be paused in its current status." }` `{ "message": "Invalid schedule values" }`
429 Too Many Requests	The request limit has been exceeded. Reduce request frequency.	`{ "message": "Rate limit exceeded" }`
500 Internal Server Error	An unexpected server error occurred. Contact support if the issue persists.	`{ "message": "Internal Server Error - Please contact support for more information." }`
502 Bad Gateway	The server received an invalid response. Retry the request.	`{ "message": "Bad Gateway - Please retry the request." }`
503 Service Unavailable	The service is temporarily unavailable. Try again later.	`{ "message": "Service Unavailable - The service is temporarily unavailable. Try again later." }`
504 Gateway Timeout	The server took too long to respond. Retry the request with exponential backoff.	`{ "message": "Gateway Timeout - The server took too long to respond. Retry with exponential backoff." }`