http://www.discovercard.com
2. American Express
http://www.americanexpress.com
3. Visa
http://www.visa.com
4. Mastercard
http://www.mastercard.com
5. JCB
https://www.jcbinternational.com
6. UnionPay
http://www.unionpay.com
7. Diners Club
http://www.dinersclub.com