src/Gateways/Wechat.php
public function refund($options = [])
    {
        $this->config = array_merge($this->config, $options);
        $this->config['op_user_id'] = isset($this->config['op_user_id']) ?: $this->userConfig->get('mch_id', '');
        $this->unsetTradeTypeAndNotifyUrl();
        return $this->getResult($this->gateway_refund, true);
    }
public function refund($options = [])
    {
        $this->config = array_merge($this->config, $options);
        $this->config['op_user_id'] = isset($this->config['op_user_id']) ?: $this->userConfig->get('mch_id', '');
        $this->unsetTradeTypeAndNotifyUrl();
        return $this->getResult($this->gateway_refund, true);
    }
订单退款操作
@param array $options
@return array
@throws GatewayException