call.cs

 
           client.DefaultRequestHeaders.Add("Client-Id", _configuration["TwitchClientId"]);
            client.DefaultRequestHeaders.Authorization =
                new AuthenticationHeaderValue("Bearer", await _getTokensFromHttpRequestService.GetAccessToken());

            var result = new ApiResult<TwitchUser>();
            var response = await client.GetAsync($"helix/users?login={loginName}");
            if (response.StatusCode == HttpStatusCode.Unauthorized)
            {
                // refresh tokens
                var (accessToken, refreshToken) = await _authService.RefreshTokens(await _getTokensFromHttpRequestService.GetRefreshToken());
                result.TokensChanged = true;
                result.NewAccessToken = accessToken;
                result.NewRefreshToken = refreshToken;
                
                // re-execute the request with the new access token
                client.DefaultRequestHeaders.Authorization =
                    new AuthenticationHeaderValue("Bearer", accessToken);
                response = await client.GetAsync($"helix/users?login={loginName}");
            }

            if (response.IsSuccessStatusCode == false)
                throw new Exception($"GetUser request failed with status code {response.StatusCode} and reason: '{response.ReasonPhrase}'");

            var responseContent = await response.Content.ReadAsStringAsync();