Go to My eBay, and click Purchase history on the left side of the page. Locate the item you purchased. If the Paid icon is blue, you've paid for your item. If the icon is grey, you might need to make a payment or update your payment status.
Contact your seller if you have any questions about your payment status. On the item page, click the Contact Seller link.
You can find most of the answers to your PayPal questions and contact PayPal for additional assistance on the PayPal Customer Support page.