Pre Payed C-Cards Question

[KingArthur]

I would like to buy something off steam but don't have a card I want to use online- Do those pre-payed cards work? I used to have one and it... If i remember right did not. However, Does anyone know?

[Locke]

I got one, and it worked for me.
You have to remember to register it online at whatever bank you buy it from.