code: protected function createBackData(array $data)
      {
          $retData = [
              'is_success'    => 'T',
              'response'  => [
                  'mch_billno'   => $data['mch_billno'],
                  'send_listid'  => $data['send_listid'],
                  'total_amount' => $data['total_amount'],
                  're_openid'    => $data['re_openid'],
                  'wxappid'      => $data['wxappid'],
                  'mch_id'       => $data['mch_id'],
                  'channel'   => Config::WX_RED,
              ],
          ];
  
          return $retData;
      }
docs: 返回数据
  @param array $data
  @return array