How to connect stripe account on behalf of an glideapp client?

Just one question, how to you price the app to the client? One shot? And what about support?

My plan is to build apps for clients, but I do expect to keep the hand on and sell apps as a service, so looking for a way to connect stripe using their account but the app is mine.

And for support, I would not provide anything excepted for characterized bugs, as long as they can do what they want through the app builder once the app is delivered.