[](https://travis-ci.org/PolymerElements/gold-cc-input) _[Demo and API Docs](https://elements.polymer-project.org/elements/gold-cc-input)_ ##<gold-cc-input> `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". ### Validation The input can detect whether a credit card number is valid, and the type of credit card it is, using the Luhn checksum. See `http://jquerycreditcardvalidator.com/` for more information. The input can be automatically validated as the user is typing by using the `auto-validate` and `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. See `Polymer.PaperInputBehavior` for more API docs. ### Styling See `Polymer.PaperInputContainer` for a list of custom properties used to style this element.