public IActionResult Index()
        {
            string           myThreemaId  = this._configuration["Threema:ThreemaId"];
            string           mySecret     = this._configuration["Threema:Secret"];
            APIConnector     apiConnector = new APIConnector(myThreemaId, mySecret, null);
            CreditsViewModel creditsViewModel;

            try
            {
                creditsViewModel = new CreditsViewModel()
                {
                    Credits = apiConnector.LookupCredits()
                };
            }
            catch (Exception ex)
            {
                creditsViewModel = new CreditsViewModel()
                {
                    ErrorMessage = ex.Message
                };
            }
            return(View(creditsViewModel));
        }