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Comment by Terretta | Hacker News Reader

For AMEX, there's still a 3 digit CSC code on the back which you will need from time to time.

The 4 digit code on the front is their CID, asked for by most merchants.

Citation needed. I have an AMEX in my wallet and it does not have any codes on the back, nor have I ever been asked for one.

It does - there is a 3 digit number on the back in the signature strip. The Amex website will ask you for it if you attempt to change your phone number, amongst other similar high-risk transactions.

I have been asked the 3 digit code when booking an airline ticket on a non-US site. During payment it passed through a amex safekey site which I think is kind of like 3d secure

http://security.stackexchange.com/a/136296

Not on mine there isn't. This may be a US-only thing?

Some discussion, which doesn't shed a whole lot of light though: https://insideflyer.com/forums/threads/what-is-the-3-digit-c...

All of my UK Amex cards have it.

At least most Spanish credit cards use the 3-digits code on the back of the credit card. And it's almost always asked for (but not in amazon iirc).

The Apple Store (as in, the actual brick and mortar establishment) started using the 3-digit code on the back of my American Express card at some point instead of the 4-digit one at the front (but they are so far the only company I have personally run into which does that).

Old comment, sorry, but I think AMEX codes are on the front of the card.

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.

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