Pre-Paid MasterCards, do they work?

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I'm more than willing to support the game, but the only way I have o pay is pre-paid master card ( I have a personal vendetta against Pay-Pal and will never use it ever again... Just saying, make sure your not a penny off...) So I'm just wondering if they will work before I go out and buy one.

Okay, if anyone was wondering, yeah, they work. Just wait an hour after activation.