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What is the card number of CR Vanguard Bill of Lading?

The first 17 digits are the card number. The card number of CR Vanguard Dike Voucher consists of 20 letters and numbers, of which the first 17 digits are the card number and the last 3 digits are the card check code. When consumers buy goods, they can use this card number to pay, and they can realize consumption discounts such as coupons and points. CR Vanguard is a retail state-owned enterprise under China Resources (Group) Co., Ltd., established in 1984, and is one of the largest retail chain enterprises in China.