After entering the store in Facebook, select the type of product you would like (ie comics, prints, etc).
(click for larger image)
Select the product you would like to purchase.
(click for larger image)
Click the ‘Add to Bag’ button.
(click for larger image)
The item now appears in your bag. You can either continue shopping or go to checkout.
(click for larger image)
When checking out, select the method you would like to pay with (ie Paypal, Google Checkout, etc).
(click for larger image)
You will then be redirected to the payment site of your choice. Log in and approve payment.
(click for larger image)