TidyCal

Now that I've set up Tidycal, I have to say it's a really good tool.
What's annoying me right now, though, is the fact that there are only two options for setting up a payment provider: Stripe and PayPal. Basically, I got along fine with PayPal. Now, because of the current political approach of both companies, I don't want to use either of them anymore.
Would it be possible to integrate a European payment service? The Dutch company Mollie or the Spanish company MONEI would be options here.