code: protected function createBackData(array $data)
      {
          // 将订单总金额金额处理为元
          $total_fee = bcdiv($data['total_fee'], 100, 2);
          // 将订单退款金额处理为元
          $refund_fee = bcdiv($data['refund_fee'], 100, 2);
  
          $retData = [
              'is_success'    => 'T',
              'response'  => [
                  'transaction_id'   => $data['transaction_id'],
                  'order_no'  => $data['out_trade_no'],
                  'refund_no' => $data['out_refund_no'],
                  'refund_id' => $data['refund_id'],
                  'refund_fee'    => $refund_fee,
                  'refund_channel' => $data['refund_channel'],
                  'amount'   => $total_fee,
                  'channel'   => Config::WX_REFUND,
  
                  'coupon_refund_fee' => bcdiv($data['coupon_refund_fee'], 100, 2),
                  'coupon_refund_count' => $data['coupon_refund_count'],
                  'cash_fee' => bcdiv($data['cash_fee'], 100, 2),
                  'cash_refund_fee' => bcdiv($data['cash_refund_fee'], 100, 2),
              ],
          ];
  
          return $retData;
      }
docs: 处理返回的数据
  @param array $data
  @return array
  @author helei