$client = new Client(); //GuzzleHttp\Client
        $api_url = config('lunaz.api_url');
        $app_code = config('lunaz.app_code');
        $merchant_code = config('lunaz.merchant_code');
        $app_key = config('lunaz.app_key');
        $signature = hash('sha256', $merchant_code.hash('sha256', $app_key));
        $params = [
            'offline' => false,
            'code' => $app_code,
            'signature' => $signature
        ];

        $result = $client->post($api_url.'trans/channel', [
            'headers' => [
                'Content-Type' => 'x-www-form-urlencoded',
                'Accept'=> 'application/json'
            ],
            'form_params' => $params
        ]);

        $response = json_decode($result->getBody());

        return response()->json($response);