Complete example with backend

[abel-123]

I'm looking for a way to build ideal payments and sepaDirectDebit subscriptions. Looks like it should be possible with this package plus the stripedart package?
It would be great to have a complete working example (i.e. including backend) to get up and running more quickly (I want to set up the backend in firebase). Could you please provide a working front+backend example code or documentation on how to set this up?

[abel-123]

just to clarify - not asking for the full code I need, just a simple working backend example that I can use as a starting point/ inspiration.