/**
  * Return final fee data
  *
  * @access public
  */
 public function return_fee()
 {
     $fee_data = $this->quantity_multiply();
     return parent::get_fee($fee_data);
 }
 /**
  * Return final fee data
  *
  * @access public
  */
 public function return_fee()
 {
     $variation_fee_data = $this->get_variation_fee_data();
     $fee_data = parent::quantity_multiply($variation_fee_data);
     return WCPF_Fee::get_fee($fee_data);
 }