How do I properly and cost effectively integrate payment systems into a website? What do I have to look out for? Which payment portals can you recommend? I have a general hatred towards PayPal, am willing to integrate it though, I want to be able to handle credit cards and as many other payment options as possible (I am based in Europe - Austria). I also want to support payments via Monero. I have experience building websites from front to backend and have handled credentials and stuff like that before in a professional environment but never integrated any payment systems so I'd appreciate links to resources, recommendations and tips for doing so in a safe and cost effective way. Thank you.