PricingService code
------------------

 this.getPriceBookList = function () {
        console.log("Enterted into getPriceBookList");
        var dataObj="grant_type=client_credentials";
        console.log("dataObj in getPriceBookList =" + angular.toJson(dataObj));
        var secret=clientKey+":"+clientPass;
        var base64Encoded= btoa(secret);

        var authorizationVal="Basic "+base64Encoded;
        console.log("authorizationVal in getPriceBookList = "+authorizationVal);

        $http({
            url: tokenAPI,
            method: 'POST',
            data: dataObj,
            withCredentials:true,
            headers: { "Content-Type": "application/x-www-form-urlencoded; charset=UTF-8" ,"Authorization":authorizationVal}
        }).then(function(response) {

                console.log("callTokenAPI result == " + JSON.stringify(response));
                var accessToken=response.data.access_token;

                console.log("callTokenAPI access token == " + accessToken);
                authorizationVal="Bearer "+accessToken;

                return $http({
                                url: fetchPriceBookUrl,
                                method: 'GET',
                                withCredentials:true,
                                headers: { "Content-Type": "application/json; charset=UTF-8" ,"Authorization":authorizationVal}
                });

      }, function(error) {
          console.log(error);
      });
 };