[hanoz]

Wouldn't it do just to hook it up to an online processor, as if a web page?

[smaudet]

Hmm, possibly but I am thinking there are some certification requirements e.g. and you have to be able to use some API whether that is hypermedia or otherwise, which again credit card companies must agree to let you use.

You could maybe bypass them with a third party API, I'd have to do my research to see what the gotchas might be though.