I turned off WiFi (was at work) and used 4G. Had my CC ready for the CVV and kept launching the App from 7:59.
It started to let me in, then would say 'we'll be back soon'. That happened a few times, then it was lightening fast.
Went to favourites, clicked buy now at the top, it asked for iTunes password, typed it in carefully, then my CVV, then got the 'Thank You'.
Checked email, and had the confirmation at 8:01am 😎