post https://api.linnworks.net/api/Auth/GetApplicationProfileBySecretKey
Returns current application subscription profile information for a given application for a specific user.
You can use this method to get the current application subscription after AuthorizedByApplication returned a session.
The session will contain Id, this is the UserId you need to supply in the call.
If there are no current subscriptions for the application for the user. The method will return null (nothing)
Rate limit: 150 / minute