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Card schemes are payment networks linked to payment cards, such as debit or credit cards, of which a bank or any other eligible financial institution can become a member. By becoming a member of gets the possibility to issue cards or acquire merchants operating on the network of that card scheme.[1][2] UnionPay, Visa and MasterCard are three of the largest global brands, known as card schemes, or card brands. Billions of transactions[3] go through their cards on a yearly basis.