gold-cc-input is a single-line text field with Material Design styling
for entering a credit card number. As the user types, the number will be
formatted by adding a space every 4 digits.
It may include an optional label, which by default is "Card number".
The input can detect whether a credit card number is valid, and the type
of credit card it is, using the Luhn checksum. See
for more information.
The input can be automatically validated as the user is typing by using
required attributes. For manual validation, the
element also has a
validate() method, which returns the validity of the
input as well sets any appropriate error messages and styles.
A list of allowable credit card types can be provided via the
property. Possible options, from
Polymer.PaperInputBehavior for more API docs.
Polymer.PaperInputContainer for a list of custom properties used to
style this element.
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