What should I do when a 412 error is returned? <Not deployed> This error occurs when the API you are trying to call has not been activated yet. Related articles What should I do when a 500 error is returned? Coupang OPEN API What should I do when a 521 error is returned? Mismatched product caused incorrect image exposure. What should I do? Do I need to register the server IP Address to use Coupang OpenAPI?