If you're reloading your Amazon account, it does not count as a purchase towards the promo as it does not take you to the regular check out page.

Also, the deal is to reload using a checking account for the 2% bonus, so credit cards are a moot point.

For me, I just use a card that has a rotating bonus category for Amazon for 5% back (and use it in conjunction with the jetblue link) or when the bonus for the quarter does not include Amazon, I'd simply buy Amazon Gift Cards at the grocery store for 3% back (or more if you have a card that gives you a better percentage on groceries)