[quote name='guyver2077']As a security precaution, we will perform an authorization on your card for $21.95. This is NOT a charge, but some banks will hold these funds for 1-5 business days.
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I think this means if your credit card does not currently have $21.95 in available funds on it, it won't go through - regardless whether they charge you or not right there and then. This is pretty standard fare.
-Hoshi