public void CallbackUrlFromattingTest()
        {
            string url1 = "https://test.domain/noPlaceholder";
            string url2 = "https://test.domain/{callbackreason}";
            string url3 = "https://test.domain/{CALLBACKREASON}";
            string url4 = "https://test.domain/{callbackReason}/addedPath";

            var resultUrl = NotificationsHandler.FormatCallbackUrl(url1, "TEST");

            Assert.AreEqual(url1, resultUrl);

            resultUrl = NotificationsHandler.FormatCallbackUrl(url2, "TEST");
            Assert.AreEqual("https://test.domain/TEST", resultUrl);

            resultUrl = NotificationsHandler.FormatCallbackUrl(url3, "TEST");
            Assert.AreEqual("https://test.domain/TEST", resultUrl);

            resultUrl = NotificationsHandler.FormatCallbackUrl(url4, "TEST");
            Assert.AreEqual("https://test.domain/TEST/addedPath", resultUrl);
        }