How can I transfer money from Apple Pay card to my debit card?

No such thing as an Apple Pay card or an Apple debit card. What are you trying to do?

Funds in your Apple Account can only be spent with Apple and cannot be transferred to Apple Cash. Apple Account funds are akin to a gift card.

Another way to think about it is that once money is on your Apple Account (or on a gift card) … it’s quite literally IN Apple’s pocket.

And they aren’t giving it back.

They will however “allow” you to exchange the value your balance for Apple products and services of like value.