The answer to this question is YES. But, under certain conditions. When cashback is combinable, it is calculated only on the amount you pay by credit card or PayPal. So, you need to be very careful when you want to combine the two. You can certainly activate cashback on an online store and use your gift card as a payment method. ⚠️ ATTENTION, this depends on each merchant. Most merchants do not accept cashback when the payment method is a gift card: this condition will be indicated in the details and conditions for obtaining cashback on the merchant page.