During the checkout process your shipping choice will be "to be confirmed by email". When I receive your order I will email the choices and cost for 1st Class and Priority Mail.
You will have the opportunity to pay for the postal service you prefer via www.PayPal.com or the card you used for the purchase. I do not keep card numbers on file. I can usually go to the card processor online and add a transaction for the shipping. If this is not possible I will create a "shipping item" for you to order and pay for online.