shebson

Looks cool. One thing you might want to fix: most of the links on the upper right of login page (FAQ, Contact, etc.) are not clickable. If you don't have that content yet, I'd just remove the placeholders.

If you have a US bank account, it's hard to beat Stripe (https://stripe.com/). They allow you to process payments without forcing users to sign up for a third-party service, and they handle compliance and the heavy lifting of recurring billing. Perhaps most importantly for your use case, they allow you to combine small charges on a monthly invoice, which reduces your processing fees (because fees on small transactions are otherwise insane). They also support euro-denominate transactions. Integration is well-documented and easy if you're comfortable with RESTful APIs.

If you prefer to bill users for each transaction instead of invoicing, Amazon Payments might be a better solution. I've never used them, but they offer a fee structure that makes small transactions less painful (https://payments.amazon.com/sdui/sdui/business?sn=devpricing...).

Good luck!