Answering my own question:
3. Excluded Transactions. The following transactions are excluded from this offer: Purchases made on eBay or on any web site or company's web site owned in whole or in part by eBay Inc., including but not limited to, www.ebay.com, www.ebay.ca, www.half.com, www.skype.com, www.shopping.com, www.stubhub.com. In addition, the following transactions are excluded: Send Money transactions, donations, PayPal Mobile transactions, payments for services, Virtual Debit Card payments, PayPal ATM/Debit Card payments, payments made when you are not logged into your PayPal account, and PayPal Plus Credit Card payments not made through your PayPal account. If the payment is refunded or cancelled at any time you are not eligible for the $5.00 USD rebate. If the payment is refunded after you receive the rebate, PayPal will deduct the rebate amount from your account.
4. Eligibility:
a. This offer is limited to the following users only:
i. Users in the United States who receive this Offer in an email sent to them directly from PayPal. Some users who receive the email Offer may also receive this Offer on the Account Overview page while they are logged into their PayPal accounts or while logging out.
ii. Users in Canada who receive the Offer in the Account Overview page while logged into their PayPal accounts.
b. Eligible users in the United States and Canada will receive a successful registration notification when they register for the promotion.
Participants must be registered PayPal account holders and must be legal United States or Canadian residents ("Eligible Participants"). You will not be eligible for the rebate if your PayPal account is not in good standing.