Apple is currently experiencing issues with delivering in app purchases to our users. Due to this, all in-app purchases on iOS devices are temporarily disabled. As soon as this is resolved, we will post an update here. Unfortunately, since this issue originates from Apple's end, we do not have a definitive timetable for a fix.
Wow what a place to accidentally press the post button anyway yeah as I was sayin, I've been gettin the purchase error message for weeks now.