I just checked. I have three AMEX cards (Platinum, Blue Cash Preferred, Green) in my wallet. All three have both four-digit numbers on the front as well as th

I just checked. I have three AMEX cards (Platinum, Blue Cash Preferred, Green) in my wallet. All three have both four-digit numbers on the front as well as three-digit numbers on the back. I don't recall ever being asked for the three-digit code on the back (like I am with most VISA/MasterCard credit cards). It's always the four-digit one on the front.