Cheap payment system

Hi everyone,
I want to create a website where people can donate to associations projects. So I need a payment pluggin as cheap as possible, or even free if it exists, knowing that I am based in France. Besides, I’ll need to know how it works. I have not created data in my user file that allows me to record the banking data of these. How should I proceed, please?

Thank you for your help

you could read some info in the internet about payment systems as there are a lot of articles

How would younuse skrill to accept payments via bubble app?