I had a weird one yesterday. I decided to use my $25 credit to get eWeather, $2.99. I was on my PC so tried to do it from the browser and the credit was greyed out. OK, whatever. I then tried to buy it using my GNex (it was connected while my N7 wasn't), again the credit was greyed out but this time it said something like it was declined. A credit declined? Weird.
Thought maybe I had to use the N7 to make the purchase so I tethered to my phone and tried again, getting the same greyed declined message. For a goof I almost purchased a song and it came up with the credit as default.
When I try this today, I seem to be able to apply the credit to app purchases on the tablet. Something weird is going on and I think I've finally found it.
eWeather is a non-American company. I know that because the debit card on my Google account won't work for non-US purchases and it didn't work for eWeather. Nor did the credit. I tried applying the credit to a few different apps and they all worked, until I got to a live wall paper called
Circuitry. I'm willing to bet this is a non-US company.
My conclusion is if you're in the US you have to use the credit for US companies. Not sure how the credit applies for non-US folks.
Maybe everybody but me knew this.