How to consume JSON Service(WebAPI) using POST method in Dynamics 365 FO

With the increasing scope of Microsoft Dynamics 365 Finance and Operations in the ERP Industry an efficient requirement is to perform its integration  with other applications.

One basic example is to perform an Integration with a JSON REST Service through a published WebAPI.

In the below example I have done the integration with Dynamics CRM where I am sending some values to CRM from Operations :-

The Code goes like this :-


    int                             find;
    real                           inventOnHandQtyval;
    str                             url,aosUri,activeDirectoryTenant;
    str                             activeDirectoryClientAppId;
    str                             activeDirectoryClientAppSecret,json;
    str                             postData,activeDirectoryResource;
    str                             aadClientAppSecret,oAuthHeader;
    str                             prdGUIDCode,prodnum;
    str                             returnValue,jsonString,jsondszstr;

    System.Net.HttpWebRequest       request;
    System.Net.HttpWebResponse      response;
    System.Byte[]                   byteArray;
    System.IO.Stream                dataStream;
    System.IO.StreamReader          streamRead;
    System.IO.StreamWriter          streamWrite;
    System.Net.ServicePoint         servicePoint;
    System.Net.ServicePointManager  servicePointmgr;
    System.Net.HttpVersion          version;
    System.Web.Script.Serialization.JavaScriptSerializer jsonSerializer;
    CLRObject                       clrObj;
    Newtonsoft.Json.JsonReader      reader;
    Newtonsoft.Json.Linq.JObject    prod;

    System.Text.Encoding            utf8;
    System.Exception                ex;
    Counter                         countCounter;
    Object                          obj;
    Map                             data;
    EcoResProduct                   ecoresproductfetch;
    EcoResProductTranslation        ecoresproductTranslation;
    InventTableModule               inventTableModule;




    try
    {
        InventTable     inventtable = sender as InventTable;

        System.Net.WebHeaderCollection  headers = new System.Net.WebHeaderCollection();
        var jsonSerializerobj = new  System.Web.Script.Serialization.JavaScriptSerializer();
        prod = new Newtonsoft.Json.Linq.JObject();
        inventOnHandQtyval = InventOnhand::newItemId(inventtable.ItemId).availPhysical();
        select inventTableModule where inventTableModule.ItemId==inventtable.ItemId;
        prod.Add("name",inventtable.itemName());
        prod.Add("productnumber",inventtable.ItemId);
        prod.Add("defaultuomscheduleid@odata.bind","/uomschedules(7F6F7338-1D80-4E90-9110-A70897C73834)");
        prod.Add("defaultuomid@odata.bind","/uoms(68A2E342-E1CA-4CC2-B430-C05057BCE7BC)");
        prod.Add("currentcost",0.00);
        prod.Add("description",inventtable.itemName());
        prod.Add("msdyn_fieldserviceproducttype",690970000);


        json=Newtonsoft.Json.JsonConvert::SerializeObject(prod);

        System.IO.MemoryStream mem = new System.IO.MemoryStream();



        new InteropPermission(InteropKind::ClrInterop).assert();



        headers = new System.Net.WebHeaderCollection();

        url = "https://abc.crm4.dynamics.com/api/data/v8.1/details";

        clrObj = System.Net.WebRequest::Create(url);

        aosUri = "https://login.windows.net/abcd1234/oauth2/authorize?";

        activeDirectoryTenant = "https://login.microsoftonline.com/abcd134/oauth2/token";

        activeDirectoryClientAppId = "xyz124";



        activeDirectoryResource = "https://abc.crm4.dynamics.com";

        Microsoft.IdentityModel.Clients.ActiveDirectory.AuthenticationContext authenticationContext =
                                new Microsoft.IdentityModel.Clients.ActiveDirectory.AuthenticationContext(activeDirectoryTenant);



        var userCredential = new  Microsoft.IdentityModel.Clients.ActiveDirectory.UserCredential("abc@xyz.onmicrosoft.com", "abc@1234");

        Microsoft.IdentityModel.Clients.ActiveDirectory.AuthenticationResult authenticationResult =
            authenticationContext.AcquireTokenAsync(activeDirectoryResource, activeDirectoryClientAppId, userCredential).Result;


        headers.Add("Authorization", authenticationResult.CreateAuthorizationHeader());

        headers.Add("Prefer", "return=representation");
        request = clrObj;

        request.Headers=headers;

        utf8 = System.Text.Encoding::get_UTF8();
        byteArray = utf8.GetBytes(json);
        request.set_Method("POST");
        request.set_KeepAlive(true);

        request.ContentType="application/json";

        request.set_ContentLength(byteArray.Length);







        servicePoint = request.get_ServicePoint();

        System.Net.ServicePointManager::set_Expect100Continue(false);

        System.Net.ServicePointManager::set_SecurityProtocol(System.Net.SecurityProtocolType::Tls12);



        dataStream = request.GetRequestStream();

        dataStream.Write(byteArray, 0, byteArray.get_Length());

        response = request.GetResponse();



            dataStream = response.GetResponseStream();


            streamRead = new System.IO.StreamReader(dataStream);

            jsonString = streamRead.ReadToEnd();



            data=RetailCommonWebAPI::getMapFromJsonString(jsonString);

            prdGUIDCode = data.lookup("productid");

            prodnum = data.lookup("productnumber");         

    }

    catch(Exception::CLRError)
    {
        ex = CLRInterop::getLastException().GetBaseException();
        error(ex.get_Message());
    }





    dataStream.Close();

    response.Close();