Can I use my apple gift card to pay my Apple Pay bill?

So basically, we want your device, give you some $$ back for it, but you CANNOT use the gift card to pay the apple Credit Card you used to buy another device with... Got it. So, here's your meager money back, but you have to buy MORE products from us, not pay towards/off what you just paid. Will find another return company that pays cash next time. Screwed again.

Well, darn. I just sent in a XR phone for this process. Had the XR and 2018-iPad Pro to turn in for the amounts and to apply to the  CC I used to purchase. Will take trade ins to store from now on or use one of the other vendors that pays cash. Thank you.

no.

Every time I traded in a device at the store they applied the amount to the purchase.