The expanded use and the increased number of charge cards require Card Issuers (or authorized agents) to implement adequate security against fraudulent use. Therefore, a critical facet in the provision of such a system is the ability to ensure the validity of the card and its authorized use in a uniform manner. The purpose of this Recommendation is to define the procedures for the validation process between Administrations. This validation process makes no attempt to specify any equipment, facilities and data transmission techniques.