
Hawkmoon269 |

You are charged when the order ships. Think of a subscription as a request for them to automatically generate orders for you for the products in that line. Each month, when they generate your subscription order (assuming their are products for it that month) they will run an authorization on your credit card. This is to just check that funds are available (a similar thing happens when you reserve a hotel room it pay at the pump for gas). The charge is only finalized when the product ships.
See this FAQ. Inside of it, click the link for authorizations to learn more. This one might also be helpful.