Merchant Testing Codes: 
- MasterCard:
 
5431111111111111
 - Amex:
 
341111111111111
 - Discover:
 
6011601160116611
 - American Express (15 digits):
 
378282246310005
 - American Express (15 digits):
 
371449635398431
 - American Express Corporate (15 digits):
 
378734493671000
 - Diners Club (14 digits):
 
30569309025904
 - Diners Club (14 digits):
 
38520000023237
 - Discover (16 digits):
 
6011111111111117
 - Discover (16 digits):
 
6011000990139424
 - JCB (16 digits):
 
3530111333300000
 - JCB (16 digits):
 
3566002020360505
 - Mastercard (16 digits):
 
5555555555554444
 - Mastercard (16 digits):
 
5105105105105100
 - Visa (16 digits):
 
4111111111111111
 - Visa (16 digits):
 
4012888888881881
 - Visa (13 digits):
 
4222222222222
  
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