Can i use Apple Pay on amazon?

Do you mean your Apple Card? If Amazon allows you to enter payment information (I assume that's the case but I've never used Amazon), you can certainly do that using your card number. See your card number by opening your Apple Card and tapping on the card icon (with the 1 2 3). You'll see your card number, and other details.

Amazon does not support Apple Pay, but you may be able to use the Apple Card as explained by muguy above this reply.