/**
  * Replace insert tag for an address
  *
  * @param Address     $address
  * @param string|null $attribute
  *
  * @return string
  */
 private function getValueForAddressTag(Address $address, $attribute = null)
 {
     if (null === $attribute) {
         return $address->generate();
     }
     $tokens = $address->getTokens();
     return $tokens[$attribute];
 }