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Heres exactly what I did to be able to do this.
1) Create 10 Day trial BC
2) On the last day of the trial, add your debit card. My Debit Card only had like 3 bucks on it, so that might be the key.
3) The "My Account" page will say that your payment is pending for about a day, then it will tell you its frozen.
4) Log on to WoW, you can still play.
Notice *Game Time Expires* and *Last* Login
Hope this wasn't a one time thing!