credit-card-details
This module contains functions to validate and mask credit card form fields.
API
maskField( fieldName, previousValue, nextValue )
Returns a masked input value for the given field based on the current value and the next value to replace it with.
unmaskField( fieldName, previousValue, nextValue )
Returns an unmasked input value that is meant to be used within the program rather than displayed to the user.
validateCardDetails( cardDetails )
Returns an object containing the errors for each field. For example the returned object might look like this:
number: 'Invalid credit card' If there are any missing fields, there are no errors for that field.
Taken from https://github.com/Automattic/wp-calypso/tree/master/client/lib/credit-card-details