src/Pay.php
protected function createGateway($gateway)
    {
        if (!file_exists(__DIR__ . '/Gateways/' . ucfirst($this->drivers) . '/' . ucfirst($gateway) . 'Gateway.php')) {
            throw new InvalidArgumentException("Gateway [$gateway] is not supported.");
        }
        $gateway = __NAMESPACE__ . '\\Gateways\\' . ucfirst($this->drivers) . '\\' . ucfirst($gateway) . 'Gateway';
        return new $gateway($this->config->get($this->drivers));
    }
protected function createGateway($gateway)
    {
        if (!file_exists(__DIR__ . '/Gateways/' . ucfirst($this->drivers) . '/' . ucfirst($gateway) . 'Gateway.php')) {
            throw new InvalidArgumentException("Gateway [$gateway] is not supported.");
        }
        $gateway = __NAMESPACE__ . '\\Gateways\\' . ucfirst($this->drivers) . '\\' . ucfirst($gateway) . 'Gateway';
        return new $gateway($this->config->get($this->drivers));
    }
创建操作网关
@param string $gateway
@return mixed