21) Call Restful API(JSON Service WebAPI) using Post Method in D365 FO (X++).

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Example is to perform an Integration with JSON REST services using basic authentication method of adding Authorization header using HTTP Post method.
In below example i have done integration with ClearTax (3rd Party App).Where i send required value to ClearTax.
class JsonResonse
{
public static void main(Args _args)
  {
    str destinationUrl = 'https://einvoicing.internal.cleartax.co/v1/govt/api/Invoice/';
    str           requestJson, responseJson;
    System.Net.HttpWebRequest  request;
    System.Net.HttpWebResponse  response = new System.Net.HttpWebResponse();
        CLRObject      clrObj;
    System.Byte[]         bytes;
    System.Text.Encoding     utf8;
    System.IO.Stream       requestStream, responseStream;
    System.IO.StreamReader    streamReader;
    System.Exception        ex;
    System.Net.WebHeaderCollection httpHeader;
    System.Net.ServicePoint    servicePt;
    str           byteStr;
    System.Byte[]      byteArray;
    System.IO.Stream     stream;
    System.IO.Stream     dataStream;
    
    requestJson = @'{
  "Version":"1.01",
  "TranDtls":{
   "TaxSch":"GST",
   "SupTyp":"B2B",
   "RegRev":"Y"
  },
  "DocDtls":{
   "Typ":"INV",
   "No":"Unique Invoice No.",
   "Dt":"Today or Yesterday Day"
  },
  "SellerDtls":{
   "Gstin":"29AAFCD5862R000",
   "LglNm":"TAN TEST NI",
   "TrdNm":"TAN TEST NI",
   "Addr1":"TEST2",
   "Addr2":"TEST2",
   "Loc":"GANDHINAGAR",
   "Pin":"560002",
   "State":"KARNATAKA",
   "Ph":"9999999999",
   "Em":"ABC@GMAIL.COM"
  },
  "BuyerDtls":{
   "Gstin":"37BZNPM9430M1kl",
   "LglNm":"TAN TEST NI",
   "Pos":"37",
   "Addr1":"TEST2",
   "Addr2":"TEST2",
   "Loc":"GANDHINAGAR",
   "Pin":"560002",
   "State":"KARNATAKA",
   "Ph":"9999999999",
   "Em":"ABC@GMAIL.COM"
  },
  "ItemList":[
   {
     "SlNo":"1",
     "IsServc":"N",
     "PrdDesc":"dfdfsdf",
     "HsnCd":"1001",
     "Qty":"10",
     "Unit":"bag",
     "UnitPrice":10.0,
     "TotAmt":151.0,
     "Discount":0.0,
     "AssAmt":151.0,
     "GstRt":10.0,
     "SgstAmt":0.0,
     "IgstAmt":10.0,
     "CgstAmt":0.0,
     "CesRt":15.0,
     "CesAmt":123.89,
     "CesNonAdvlAmt":0.0,
     "StateCesRt":36.0,
     "StateCesAmt":151.0,
     "StateCesNonAdvlAmt":0.0,
     "OthChrg":0.0,
     "TotItemVal":100.0
   }
  ],
  "ValDtls":{
   "AssVal":100.0,
   "CgstVal":0.0,
   "SgstVal":0.0,
   "IgstVal":0.0,
   "CesVal":15.0,
   "StCesVal":36.0,
   "RndOffAmt":0.0,
   "TotInvVal":0.0
  }
}';
 try
    {
      new InteropPermission(InteropKind::ClrInterop).assert();
      httpHeader = new System.Net.WebHeaderCollection();
      request = System.Net.WebRequest::Create(destinationUrl);
      utf8 = System.Text.Encoding::get_UTF8();
      bytes = utf8.GetBytes(requestJson);
       request.set_Method("POST");
      httpHeader.Add("Schema-Type:govt_schema_v1.1");
      httpHeader.Add("Pass Owner Id");
      httpHeader.Add("GSTIN");
      request.set_Headers(httpHeader);
      request.ContentType = 'application/json';
      request.set_ContentLength(bytes.get_Length());
      requestStream = request.GetRequestStream();
      requestStream.Write(bytes, 0, bytes.get_Length());
      response = request.GetResponse();
      responseStream = response.GetResponseStream();
      streamReader = new System.IO.StreamReader(responseStream);
      responseJson = streamReader.ReadToEnd();
      info(responseJson);
    }
    catch (Exception::CLRError)
    {
      ex = CLRInterop::getLastException().GetBaseException();
      error(ex.get_Message());
    }
    requestStream.Close();
    streamReader.Close();
    responseStream.Close();
    response.Close();
  }
}

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