woocommerce/includes/payment-tokens/class-wc-payment-token-echeck.php

<?php

if ( ! defined( 'ABSPATH' ) ) {
	exit; // Exit if accessed directly
}

/**
 * WooCommerce eCheck Payment Token.
 *
 * Representation of a payment token for eChecks.
 *
 * @class 		WC_Payment_Token_eCheck
 * @since		2.6.0
 * @category 	PaymentTokens
 * @package 	WooCommerce/PaymentTokens
 * @author		WooThemes
 */
class WC_Payment_Token_eCheck extends WC_Payment_Token {

	/** @protected string Token Type String */
	protected $type = 'eCheck';

 	/**
	 * Validate eCheck payment tokens.
	 *
	 * These fields are required by all eCheck payment tokens:
	 * last4  - string Last 4 digits of the check
	 *
	 * @since 2.6.0
	 * @return boolean True if the passed data is valid
	 */
	public function validate() {
		if ( false === parent::validate() ) {
			return false;
		}

		if ( ! $this->get_last4() ) {
			return false;
		}
		return true;
	}

	/**
	 * Returns the last four digits.
	 * @since 2.6.0
	 * @return string Last 4 digits
	 */
	public function get_last4() {
		return $this->get_meta( 'last4' );
	}

	/**
	 * Set the last four digits.
	 * @since 2.6.0
	 * @param string $last4
	 */
	public function set_last4( $last4 ) {
		$this->add_meta_data( 'last4', $last4, true );
	}

}