To view the payment you have made to purchase an item, just select the 'Account Summary' link. In the following screen, select 'Sale Payments' (please change the status delivery of the the product).
All of your payments can be viewed from this section. Note, that the payments accept credit cards. PayPal will not be listed here until the administrator approves the sale.
Once the requested item is successfully delivered to you, remember to change the delivered status to 'yes'. This can be done when you select the 'delivered' link near the payment row.