A credit card security system employs a personal identification code in the form of a combination of numerals or letters combined with a pre-selected color, and issued to a credit card customer by a credit issuing company preferably in the form of a token having a face of the appropriate color and provided with suitable indicia setting forth the numeral or letter combination part of the code, or as a decal likewise setting forth the code. A card in the form of a planar element is provided with a suitable surface containing a grid of generally rectangular boxes each of a different color is provided to a merchant, and the like, honoring a card issued by the particular credit card company so that a person presenting a card for payment of goods or services can inscribe the indicia of the identification code into the properly colored box. Preferably, the card forming the grid of colored boxes is a removable part of a credit sales slip. If decals are provided by the credit card company to indicate the personal identification code, they can be placed on an appropriate block-like member having either appropriately color-coded faces or of a uniform color with color-coded indicia provided on the associated decal.