You have an email from PayPal confirming your payment. This is a picture showing you how to find the item number ...

Click here if you have NOT received an email confirming your payment.
Enter the item/product number as sent by PayPal: Include only numbers, please.
Enter the name on the document:
Email address to receive the document: N.B. Take special care to get this right. Most lost documents are caused by errors in the email address.