/**
  * Main plugin Instance
  *
  * @return YITH_Multistep_Checkout Main instance
  * @author Andrea Grillo <*****@*****.**>
  */
 public static function instance()
 {
     if (is_null(self::$_instance)) {
         self::$_instance = new self();
     }
     return self::$_instance;
 }
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 /**
  * Unique access to instance of YITH_Vendors class
  *
  * @return YITH_Multistep_Checkout|YITH_Multistep_Checkout_Premium
  * @since 1.0.0
  */
 function YITH_Multistep_Checkout()
 {
     // Load required classes and functions
     require_once YITH_WCMS_PATH . 'includes/class.yith-multistep-checkout.php';
     if (defined('YITH_WCMS_PREMIUM') && file_exists(YITH_WCMS_PATH . 'includes/class.yith-multistep-checkout-premium.php')) {
         require_once YITH_WCMS_PATH . 'includes/class.yith-multistep-checkout-premium.php';
         return YITH_Multistep_Checkout_Premium::instance();
     }
     return YITH_Multistep_Checkout::instance();
 }