I have always received wrong bills whenever I have purchased a service from somone that uses Linkpoint.com

What kind of merchant account is it? You must have your merchant account and then use them as a gateway to your merchant account or what?

The fact that you can charge as much as you need is very good but it seems there are a lot of bugs in their interface.

I myself use Paysystems (Revecom) and never had a major problem.