The Custom API Integration feature is not recommended for everybody and we advise this feature be implemented by experienced developers only.
If you would like to try this with your own MagCast, we have included the script for this integration below.
You can then ensure that once a person enters their details in MagCast as a current subscriber, that it’s sent to your server script to check whether the user is in your database along with their subscription duration.
Once the script has checked that it should then return the info to MagCast so that the correct issues will be available to the reader/subscriber.
The custom API script can be downloaded here