This connects Stripe and group membership, which can then be leveraged as you wish. However, this probably isn’t quite what you are after.
I don’t think that there is currently a plugin to do discrete (one-off) purchases via Stripe, but it sure would be helpful. We’d love it in order to accept payment for events, without having to do painful workarounds.
I started work on something like that. It counted on an external escrow service and staff to manage it manually (though it could theoretically be automated).
Integration with a two way service like PayPal, could be done, but it would be a fair amount of work. I’d think a week or two.