Question On payment using amazon cash

So i've been using Crysta to purchase my entry sub per month, I was recently was gifted some money on my amazon account so i was wondering if theres a way to buy crysta using amazon credit. I've looked but i can't find anything. i can buy a timecard but i need a standard membership. i wanted to buy crysta so i can upgrade to collectors edistion and pay for my sub any help would greatly help :D



Thanks

Wasn't sure where to put this so i figured i'd put it right here.

not to sound like a total noob, but i cant even figure out where to use the 1500 crysta i was given by a friend to purchase more game time cant find it anywhere...any help?