Visa is the world's No. 1 card network, accepted at over 100 million merchants in more than 200 countries. Backed by an overwhelming share of the North American and European markets, including Korea, the United States, and the United Kingdom, you can accept payments from customers worldwide with a single contract.

Mastercard is the world's No. 2 card network, accepted at over 110 million merchants in more than 210 countries. It is a leading card in the Korean market as well as in some European countries such as Sweden, and it also holds a strong position across Latin America.

American Express (Amex) is a premium card network accepted at over 170 million merchants in more than 160 countries.

UnionPay is the card network with the most cards issued in the world, accepted in more than 185 countries. Beyond mainland China, it is rapidly expanding across Hong Kong, Macau, and Southeast Asia, and it accounts for an overwhelming share of Asia-Pacific transactions.

JCB is Asia's leading international card brand, founded in Japan with more than 180 million cards issued. Through its 20-year partnership with Discover, it is widely accepted across the Americas as well as through its own merchant network throughout Asia.

Diners Club is the world's first credit card brand, launched in 1950, with a merchant network spanning more than 190 countries.

For Korean merchants, PayPal is not a payment method for domestic consumers but a cross-border method for accepting payments from overseas customers.

Built into KakaoTalk, Kakao Pay is one of the most familiar payment buttons for online consumers in Korea.