Question : credit card combo

how many digits are each
Visa
MasterCard
Maestro
Diners Club
Solo
American Express


and what format are they in
 '-'   or ' '

visa
is
4-4-4-4

Answer : credit card combo

Please check the following test credit card numbers:

https://www.paypalobjects.com/en_US/vhelp/paypalmanager_help/credit_card_numbers.htm