(EU-based freelancer and SaaS builder here). I can warmly recommend https://www.recurly.com https://www.recurly.com, which I use to handle recurring billing on

(EU-based freelancer and SaaS builder here). I can warmly recommend https://www.recurly.com https://www.recurly.com, which I use to handle recurring billing on a number of projects (my own SaaS https://www.wisecashhq.com https://www.wisecashhq.com, but also client projects such as https://www.boxcar.io/developer https://www.boxcar.io/developer and https://www.process-one.net/en/ejabberd/saas/ https://www.process-one.net/en/ejabberd/saas/). It can be used together with Stripe as a gateway (much recommended, the setup is much faster than on other gateways), and provides a full-featured setup with PCI SAQ A, VAT handling, PDF invoices, coupons, dunning etc.