Security Code
On American Express cards, the security code is the four-digit code on the front of the card.
On Discover cards, the security code is the three-digit code on the back of the card.
On MasterCards, the security code is the three-digit code on the back of the card.
On Visa cards, the security code is the three-digit code on the back of the card.
On JCB cards, the security code is the three-digit code on the back of the card.
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