Why are some eBay rewards deposited immediately?
When you make a purchase that is eligible for cashback on eBay using PayPal, PayPal might decide that your cashback reward is eligible for immediate deposit (see eBay’s User Agreement). For these rewards, check the PayPal account that you used to make the purchase and see your cashback there. For eBay purchases that aren’t rewarded immediately, your reward will be deposited automatically after 60 days in the PayPal account that you used to make the purchase. If you decide to return your purchase that earned immediately rewarded cashback, PayPal will reverse the cashback reward.