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I'm asking because either I am moving the endpoints of the selfservice into my own backend app, or I modify the UI of the selfservice instead

And last, is there an example for a Go implementation of the self-service?

It's a reference implementation, so just purely to show how it all pieces together, and so probably shouldn't be used as is in Production.

you can modify and use it in production, but it is not hardened in any way, so definitely review how it works