This API adds new attributes to the catalog. If the API request contains attributes that already exist, they will not be added again.
Authentication is done via Basic Auth. This requires a base64-encoded string of your credentials in the format 'username:password'.
For more information on authentication and getting your credentials, refer here.
This is the Workspace ID of your MoEngage account that must be passed with the request. You can find it in the MoEngage dashboard at Settings > Account > APIs > Workspace ID (earlier app id).
The unique identifier for the catalog, obtained during catalog creation.
A list of new attributes to add to the catalog schema.