/**
  * @param \Magento\Quote\Model\Quote               $quote
  * @param \Magento\Quote\Model\Quote\Address\Total $total
  *
  * @return array|null
  */
 public function fetch(\Magento\Quote\Model\Quote $quote, \Magento\Quote\Model\Quote\Address\Total $total)
 {
     $result = null;
     $amount = $total->getDiscountCouponAmount();
     $result = ['code' => $this->getCode(), 'title' => __('Discount Mercado Pago'), 'value' => $amount];
     return $result;
 }