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NetSuite Professionals

using (var clnt = new HttpClient())
{	
	clnt.DefaultRequestHeaders.Accept.Clear();
	clnt.DefaultRequestHeaders.TryAddWithoutValidation("Authorization", "NLAuth nlauth_account=XXXXXX_SB1,nlauth_email=XXXXXXXXX,nlauth_signature=XXXXXXXXXX,nlauth_role=3");
	clnt.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
	clnt.DefaultRequestHeaders.Add("User-Agent-X", "SuiteScript Call");
	clnt.DefaultRequestHeaders.Add("recordtype", System.Web.HttpUtility.UrlEncode("customer"));
	clnt.DefaultRequestHeaders.Add("id", System.Web.HttpUtility.UrlEncode("8245"));
	clnt.DefaultRequestHeaders.Add("datain", System.Web.HttpUtility.UrlEncode("{\"recordtype\": \"customer\",\"id\": \"8245\"}"));
	
	ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
	
	HttpResponseMessage response = await clnt.GetAsync("<https://XXXXXX_SB1.restlets.api.netsuite.com/app/site/hosting/restlet.nl?script=332&amp;deploy=1>");
	if (response.IsSuccessStatusCode)
	{
		Customer customer = await response.Content.ReadAsAsync&lt;Customer&gt;();		
	}
}

i am getting error 'SSS_MISSING_REQD_ARGUMENT'