Swap system on own website

Hey everyone!

Maybe I’m asking a stupid question, but I need to create an exchange system on my own website. Honestly, I don’t even know if this is possible. But if it is possible, is there a good guild with instructions how to install it successfully?

It can use any platform which help me with making this possible. I have seen multiple website with the same system, but I don’t know how to make it :frowning:

Thank you!