GoCoinAPI.Client.authorize_api C# (CSharp) Method

    public bool authorize_api() {
      // if (string.IsNullOrEmpty(this.getToken()) == false)
        if (this.getToken() != null) {
            return true;
        }        
        return this.get_token_from_request();        
    }

        protected void getauthorizeapi()
        {
            Client client = new Client();
            client.client_id = "895963850ade9e8f5652ecabc7e16b3d561ea22f8d8b4c4207e6784a0db3a01f";
            client.client_secret = "6b08be21178a7f76229d7cae91a33eed023b7bf5aede577f4cc7d73ec5bd6e3f";
            client.scope = "invoice_read_write";
            client.redirect_uri = "http://119.226.189.186:8100/DemoWebGoCoin/";

            Boolean b_auth = client.authorize_api();
            if (b_auth)
            {
                GoCoinAPI.User currentuser = new GoCoinAPI.User();
                currentuser = client.api.user.self();

                GoCoinAPI.Invoices invoices = new GoCoinAPI.Invoices();
                invoices.price_currency = "BTC";
                invoices.base_price = 20000;
                invoices.base_price_currency = "USD";
                invoices.confirmations_required = 6;
                invoices.notification_level = "all";

                LitInvoices.Text = SerializeJson(client.api.invoices.create(currentuser.merchant_id, invoices));

            }
            else
            {
                Response.Redirect("Error in getting the Invoices Data", false);
            }
        }