Yep, fortunately in Europe we can issue credit notes, making our job easier. I do think giving the possibility to send charges information to a webhook is a great way to start: this data can be plugged to any invoicing system (or any tax, payment providers) who are trying to solve those things. The hardest part for me, when working in that fintech, was to build the whole logic to trigger the invoice, not so much the invoice itself. But this company was a EU company, probably easier to work with invoices