I see that the digital version of the game is on sale on the SE store site. If I get it now, does it automatically apply to my game account? Or do I have to enter a code first? Also if I have to enter a code, do I have to do it when I buy the expansion or can I wait a few months and then apply the code? I don't want to actually apply it to my game right this second, as I have other things I want to do in the game before I update it, but getting it on sale is a nice deal and I want to make sure the code will be good so I can apply it once I am ready.