The Shop is down at the moment (7:30 p.m. EST) and has been for a bit now. I don't know if there is scheduled maintenance going on or there is another problem - but the main www.huntedcow.com is down as well (I was going to try to use the Contact Form there to tell them but that's on part of the site that's down).
Since the Shop is the money earner is seems pretty important to get it back up If it's supposed to be down for some maintenance right now, feel free to point it out. I don't see that it is.
It also ends up leaving an endless load loop in game when trying to charge new currency because of the shop being down.