First, be careful. There is a scam I'm seeing a lot where people try to use this procedure to trick you. Do you see the transaction in your PayPal activity log at all? If so, click into the details, and you'll find a link in there that allows you to add the tracking number to the transaction. If you don't see the transaction in your activity log then it didn't happen, and they never sent any payment at all. The email you got could be a fake, where they are claiming you need to ship the item before funds will be released. Again, if there is no transaction showing in your activity log for this sale then no payment was made. If there is, then that's where you'll find the link to enter the tracking number.
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