// usage{type: 'Mastercard'})

Generate a random credit card number. This card number will pass the Luhn algorithm so it looks like a legit card.;
=> '6304038511073827'

Optionally specify a particular type of card to return:{type: 'Mastercard'});
=> '5171206237468496'

The type can be specified by the long name, or by the short name:{type: 'mc'});
=> '5103820202214116'

The types are enumerated below.