Thought about this in a conceptual way some years ago [1] and the best option seems to be to let the developers decide how they want to be paid, i.e. have a `thanks.dev` file in the tree of the package with JSON-like data, e.g.

  "payment": "iban", "data": "IBANCODE"` or 
  "payment": "link", "data": "https://..." or
  "payment": "cryptoCoin", "data": "0xb3..." and so forth.

Of course, the problem is there are many different ways of giving thanks, so a protocol is required, that's the hard part actually in this space, standardization.

[1] https://github.com/ly3xqhl8g9/delicense