Not sure how easy it is to do. But surely, as the "webapp" you can also revoke a users subscription. I have been thinking about "recurring payment" with an ag

Not sure how easy it is to do. But surely, as the "webapp" you can also revoke a users subscription. I have been thinking about "recurring payment" with an agreed, "we the webapp" will cancel your paid access if you have been absent of the site "x days" or more likely 2 months.