Calling an External Web API from Controller - No Jquery

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The challenge is to call an external API and put it into a model you can use.

The example below has a simple model STAPI_DTO which has two string fields - one of which is a client key which is what I am after

string serviceURL = "https://someurl" + appt.POSID;
var client = new WebClient();

 //where STAPI_DTO is my model
 STAPI_DTO st = new STAPI_DTO();
  STAPI_DTO result = JsonConvert.DeserializeObject(client.DownloadString(serviceURL));
 string clientkey = result.APIKEY;

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