[](https://travis-ci.org/PolymerElements/gold-cc-cvc-input) _[Demo and API Docs](https://elements.polymer-project.org/elements/gold-cc-cvc-input)_ ##<gold-cc-cvc-input> `gold-cc-cvc-input` is a single-line text field with Material Design styling for entering a credit card's CVC (Card Verification Code). It supports both 4-digit Amex CVCs and non-Amex 3-digit CVCs It may include an optional label, which by default is "CVC". It can be used together with a `gold-cc-input` by binding the `cardType` property: ### Validation The input considers a valid amex CVC to be 4 digits long, and 3 digits otherwise. The `amex` attribute can also be bound to a `gold-cc-input`'s `card-type` attribute. 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.