Hi! Late to the party, but this is exactly the kind of problem that my startup, ...

Hi! Late to the party, but this is exactly the kind of problem that my startup, Trolley, solves.

Warning: shameless plug.

It's a no-code shopping cart that works with Stripe. We offer digital downloads that work as you describe.

You could check it out - https://trolley.link

(you can email me direct at rg@trolley.link if you want to know anything more)