Why is an email address required for online bill payment?

PayPal requires an email address for payments because your receipt is emailed to you. If your payment was made for a lost item, and you find the item, you will need the receipt to request a refund. Refund requests must be made within 90 days of payment. (Google Chrome users, please note: Chrome has not been working well with PayPal lately. If you have trouble, please try another web browser.)