Payum\Paypal\Masspay\Nvp\PaypalMasspayGatewayFactory::populateConfig PHP Method

    protected function populateConfig(ArrayObject $config)
    {
        $config->defaults(array('payum.factory_name' => 'paypal_masspay_nvp', 'payum.factory_title' => 'PayPal Masspay', 'payum.action.payout' => new PayoutAction(), 'payum.action.api.masspay' => new MasspayAction(), 'payum.action.convert_payout' => new ConvertPayoutAction(), 'payum.action.get_payout_status' => new GetPayoutStatusAction()));
        if (false == $config['payum.api']) {
            $config['payum.default_options'] = array('username' => '', 'password' => '', 'signature' => '', 'sandbox' => true);
            $config->defaults($config['payum.default_options']);
            $config['payum.required_options'] = array('username', 'password', 'signature');
            $config['payum.api'] = function (ArrayObject $config) {
                $config->validateNotEmpty($config['payum.required_options']);
                $paypalConfig = ['username' => $config['username'], 'password' => $config['password'], 'signature' => $config['signature'], 'sandbox' => $config['sandbox']];
                return new Api($paypalConfig, $config['payum.http_client'], $config['httplug.message_factory']);
            };
        }
    }