Hello. I’m back after a long time, I’m about to buy the Shadowlands Epic Edition, but before I do it, I have a question, can I use it’s game time right away? Or should I buy the Heroic Edition for the moment? I have a balance of 80E in my account. And let’s say that I buy the Heroic Edition, and the game time, later when I want to upgrade to epic edition, do I pay the same difference amount of money from Heroic to Epic?
I can’t wait for answers. I really want to play this game ASAP 
The gametime will start right away after the payment is finished.
If you buy Heroic first, then later upgrade to Epic you only pay the difference.
I do not recommend buying anything at this moment, including gametime due the fact there are serious problems with the payment system as reported on the forums and the login authentication servers.
Come back again later when things are fixed so you can enjoy your time at Azeroth!
Thank you very much Saneko for your answer, I had seen today early that something went wrong also with the game itself, when I tried to login. Then I guess I will start with the Epic, if I can use that one month game time right away, I really appreciate the time and effort you wasted to answer and help me.
Sincerely,
Anuar