I too would like to know about certification. I have joined IS-ART, I have attended the training. In the training we were told that IS-ART has an online certification exam that you can complete after joining. I do not see this.
Just email is-art and they will email you the link for the test (you can’t find it on the site otherwise). It wasn’t automatically emailed out from the training when I took it. Is-art is great at responding to emails.