/**
  * Check whether payment method can be used
  *
  * @param Mage_Sales_Model_Quote $quote
  * @return boolean
  */
 public function isAvailable($quote = null)
 {
     if (!parent::isAvailable($quote)) {
         return false;
     }
     if ($this->is3dSecureEnabled() && Mage::app()->getStore()->isAdmin()) {
         return false;
     }
     return true;
 }