How do i consume web API from console application ?

Question

I am getting a response from the postman. But when I run my console application i cant catch the response data. Please someone guide how to do this? This is GPS data, providing API from one of our client, and i just want to consume the data and save the response from the API. I am passing vechile Numbers,start and end dates and getting the data in fields.

static async Task RunAsync()
{
using (var client = new HttpClient())
{
client.BaseAddress = new Uri("http://api.blabla.com/");
client.DefaultRequestHeaders.Accept.Clear();
client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
try
{
// HTTP POST
var dat = new APIEntity()
{
unitCodes = new List<int>() {19215,19216,...}, /
/ Multiple vehicle numbers
start = DateTime.ParseExact("2018-03-12 01:00:00", "yyyy-MM-dd HH:mm:ss", null), // format : ISO 8601.
end = DateTime.ParseExact("2018-03-12 23:00:00", "yyyy-MM-dd HH:mm:ss", null), // format : ISO 8601.
fields = new List<string>()
{ "unitCode", "timedate", "latitude", "longitude", "ignition", "velocity", "positionerror", "digitherm5", "direction", "distance" } // I should get the values of the fields and save it to my database. };
HttpResponseMessage postresponse = await client.PostAsJsonAsync("api/points", dat);
postresponse.EnsureSuccessStatusCode(); // postrespones code 200 ok.
if (postresponse.IsSuccessStatusCode)
{
???????? // how to fetch the data?
}
}
catch (HttpRequestException e)
{
Console.WriteLine(e.Message);
}
}
}
static void Main()
{
RunAsync().Wait();
}

My Model is:

public class APIEntity
{
public List<int> unitCodes { get; set; }
public DateTime start { get; set; }
public DateTime end { get; set; }
public List<string> fields { get; set; }
}

For your reference : Postman Request is :

 

{ "unitCodes": [ 19215, 19216, 19224 ], "start":"2018-03-20T09:00:00.000Z", "end":"2018-03-20T15:10:00.000Z", "fields": [ "unitCode", "timedate", "latitude", "longitude", "ignition", "velocity", "positionerror", "digitherm5", "direction", "distance" ] } and Respose is : { "status": "Success", "data": [ { "unitCode": 19215, "timedate": "2018-03-20 09:01:23", "latitude": 25.216296552475924, "longitude": 55.26109752059169, "ignition": false, "velocity": 0, "positionError": false, "seatCount": 0 }, { "unitCode": 19215, "timedate": "2018-03-20 09:11:23", "latitude": 25.216199149650755, "longitude": 55.261200652994816, "ignition": false, "velocity": 0.03, "positionError": false, "seatCount": 0 }, ...... ............... }

 

I have a doubt, Since its a post request, how should I receive the response from the colsole application? Should i really need to write GET request? but they are providing only the POST method ? Is this possible to achieve this?