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Since the transaction is finalised, I doubt adding gift card can work retroactively, as this is not a practice of online businesses, not just apple.
 
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Can’t be done, better off canceling your order now, add the gift cards to your apple account, then reorder the phone.

Or keep your current order, use the gift cards for something else.
 
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ordered 13 Pro Max a few days ago...

just remembered that I still have four $100 Apple Gift Cards, will they let me apply them retroactively?

or must I place a new order? (by redeeming the four cards into my Apple account first)

Not really looking forward to placing a new order as it will add an extra week to my current expected delivery date of November 1 :) )

(the four $100 Apple Gift Cards are physical gift cards that I originally purchased from Best Buy a few months ago when they had that "buy $100 Apple Gift Card, get $10 Best Buy gift card" deal)
Don’t think so. Amazon is the only retailer I know that you can easily change the payment method after ordering if the product hasn’t shipped yet.
You can call but I doubt it
 
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