Alternative to Paypal "Buy buttons" for European-based companies?

FastSpring is all-inclusive and works with companies all over the world. Order pages are translated into 18 languages, end customers can pay using foreign currencies, VAT is properly collected when required, etc. For SaaS services, try SaaSy.com

I was just skimming through their docs and came accross this:

>One major drawback with Advanced Integration is that anyone can see the HTML code for your "Buy Now" buttons, which means that a third-party can tamper with the item variables and make fraudulent payments if they so choose. [1]

Um, no... wtf?

[1] https://dev.alertpay.com/en/integration-tools/html-integrati...