////////////////////////////////////////////////////////////////////////////////////////////////////
        /// <summary> This function concatenates the api string into the url, 
        /// and instantiates the parsers and serializers.</summary>
        ////////////////////////////////////////////////////////////////////////////////////////////////////
        private void InitApiUrlAndObjects()
        {
            url = string.Format(url, Constants.apiOAuth);

            //As the whole api uses the same parser and serializer, 
            //these two are instanciated and fixed
            serializer = new FormUrlSerializer();
            parser = new FormUrlParser();
        }
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 /// <summary> This function concatenates the api string into the url, 
 /// and instantiates the parsers and serializers.</summary>
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 private void InitApiUrlAndObjects()
 {
     url = string.Format(url, string.Format(Constants.apiAdvertising, sandboxString));
     //As the whole api uses the same parser and serializer, 
     //these two are instanciated and fixed
     serializer = new FormUrlSerializer();
     parser = new XMLParser();
 }