I haven't bought from Astak so I don't know what their business practice is. However, the law (as I understand it) in the United States is that a credit card cannot be charged until the order is shipped. It is OK to check the validity of a card, but not to charge for unshipped merchandise. (I believe the "definition" of "shipped" for ths purpose is "packaged and ready to be shipped within 24 hours.")
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