Was trying to purchase a sub but nothing goes through. Is the store down or something?
Same issue here - tried the site, the client, and the launcher.
Looking at DownDetector, it seems to be an issue on their side. Even though all forum posts about 500 errors direct you to clear cache/cookies/payment methods and such, lol.
Was just able to get in and purchase - it was waiting until I posted on the forums, lol.