If there is a hidden basket, it is unfortunately extremely hidden.
I don't have a problem with the payments, but I haven't bought anything, sense the kits release day. So it can definitely have broken after that. It wouldn't surprise me; they managed to break the downloading again.
Have you tried turning off the VPN and restarting the app or even the computer so they do a clean start without the VPN? That might help.
Also, while we are complaining about the app, it really sucks with anything related to offline. It throws a tantrum if it is offline too long, it can't start games offline, and the remember me feature doesn't work if it lost internet in between logins.