this is kind of a serious question for myself (on SSDI), and I’d imagine others that are on mostly fixed income. I’d like to pre-purchase as I’ve $$$ on my balance, but am so afraid that if I click it the balance wont be used and my card will be charged.
Yes, you can pay with the balance. Payed for my BfA that way.
Make a post over in customer support to be sure if you want a direct answer. 
Vrak’s pretty cool over there.
hehe, thanks…I had enough to be able to do it…was worried, but it allowed me to choose my balance (down to about $2 left, but I’ll survive).