Uionpay, VISA, MasterCard Introduction: VISA International is a non-profit global organization, with the participation of all banks willing to issue VISA cards. Headquartered in the San Francisco Bay Area, USA, it divides the world into six regions to conduct business and provide services and business promotion for its members in each region. VISA International actively develops and promotes various plastic currency products, such as smart cards and debit cards. Visa is not only synonymous with payment cards or credit products. Products and services branded with Visa represent the safest, most convenient and most reliable payment method, allowing consumers to trade at any time, anywhere and in any way. MasterCard: mastercard international is a non-profit global organization with the participation of all banks willing to issue MasterCard. In addition to providing global credit card network and clearing, mastercard international also actively develops and promotes various plastic currency products, such as debit cards, stored-value chip cards and platinum cards. Union Pay (uionpay): It means China. It meets the requirements of unified business norms and technical standards and must have the logo of Union Pay. The difference between uionpay, VISA and MasterCard: It provides a unified identification mark for all kinds of ATM and POS terminals to accept bank cards issued by commercial banks, so that bank cards issued by different banks can be used in ATM and POS terminals with UnionPay logo, providing consumers with convenient, fast and safe financial services. The introduction of VISA Verification Service (vbv) suggests that bank cards with the logo of UnionPay must conform to the unified business norms and technical standards stipulated by the People's Bank of China and be approved by the People's Bank of China. In addition to the logo of UnionPay, dual-currency credit cards also have the logos of VISA, MasterCard, AmericanExpress and JCB.