Cloud application frontend advice?

We are considering creating some cloud based applications. Access would be based on an annual subscription fee. Just wondering if anyone else has pursued this and if they are using a frontend login application where you would verify their subscription status, provide an option to renew if it’s expired… etc.

Looking for advice on what is the best way to proceed.

@Bob Keeney over at BKeeney Software did this with his Xojo Training system.