The request to Text Classification API must be made entering in the key parameter the API key of the user who created the model. Otherwise, the response will be a 201 error:
MeaningCloud provides a series of clients to interface its APIs. You can use the Text Classification clients in any of the different languages to include your classification model in our application.
An example of application integration of this API is your Excel Add-in, from which you can use your own models in an Excel spreadsheet.