public async Task <IHttpActionResult> GetUnknownMessages([FromUri] string key)
        {
            var isKeyMatch = object.Equals(key, CloudConfigurationManager.GetSetting("Key"));

            if (isKeyMatch)
            {
                // Get the token here to proactively trigger a refresh if the cached token is expired
                // This avoids a race condition in MicrosoftAppCredentials.GetTokenAsync that can lead it to return an expired token
                await this.botCredentials.GetTokenAsync();

                var result =
                    await _botRepository.UnknownMessageExport(DateTime.UtcNow.AddDays(-1 * Constants.FeedBackDelayDays));

                return(this.Ok(result));
            }
            else
            {
                return(this.Unauthorized());
            }
        }