You can track the status of items you are buying and selling (if you have a seller's account) and update the status under the Take action menu in My eBay.
Marking an Item as Paid
If you paid for an item and My eBay is still showing it needs to be paid, you can manually mark the item as paid for your own records. Marking your item as paid does not notify the seller. Regardless of what the status shows in My eBay, as long as your seller acknowledges receiving payment, your part of the transaction is complete.
To mark an item as paid:Go to My eBay » click Won (from the left navigation menu)
In the Won section find the item you want to mark as paid.
From the Take action drop-down menu, select Mark as Payment Sent. The 
icon turns blue, showing that payment is complete.
Note: If you pay for your item using PayPal, or the seller marks the item as Payment Received on their My eBay page, the payment status in My eBay will automatically update to Payment Sent. However, if you paid using another payment method, and you manually mark the item as Payment Sent, the seller is not automatically notified.
Marking an item as Posted
After you post an item to a buyer, you can mark the item as posted for your records. Marking your item as posted does not notify the buyer.
To mark an item you sent as posted:Go to My eBay » click Sold (from the left navigation menu)
In the Sold section, find the item you want to mark as posted.
From the Take action drop-down menu, select Mark as Posted. The 
turns gold, showing that you've posted the item.
Note: You can also send an invoice and relist an item from the Take action menu.
Must use Buy It Now and PayPal.
