You authorize Exafunction to charge all sums for the orders that you make and any level of Service you select as described in these Terms or published by Exafunction, including all applicable taxes, to the payment method specified in your account. If you pay any fees with a credit card, then Exafunction may seek pre-authorization of your credit card account prior to your purchase to verify that the credit card is valid and has the necessary funds or credit available to cover your purchase.</p>