Payments through 3rd party cart + Stripe

I’d like to create a sales funnel with bumb offer and upsell.

Is this possible without custom development and if so what to do:

1. I sell Una membership, bump offer, and upsell with 3rd party cart that is integrated with Stripe.
2. Stripe sends information to Una.
3. Una sends login information to customer.
4. The customer is able to cancel his membership through Una.

What do you think?

Thanks!