As of December 31, 2017, there were 20.48 billion credit, debit, and prepaid cards in circulation worldwide including global general purpose cards—Visa, UnionPay, Mastercard, Maestro, JCB, Discover/Diners Club, and American Express—and more than 60 domestic-only general purpose brands in over 60 countries. Those brands included RuPay, Elo, Mir, Troy, BC Card, Interac, eftpos, CB (Cartes Bancaires), girocard, CuentaRut, Verve, and others. Also included in the 20.48 billion payment cards were private label credit, debit, and prepaid cards for stores, fuel, airlines, medical, and more. Gen...