/// <inheritdoc/> public async Task <bool> AuthenticationByCode(string code, string redirectUrl) { var form = new Dictionary <string, string> { { "grant_type", "authorization_code" }, { "code", code }, { "client_id", clientId }, { "client_secret", clientSecret }, { "redirect_uri", redirectUrl } }; authTokens = await http.PostForm <AuthToken>(TokenUrl, form).ConfigureAwait(false); if (authTokens == null) { return(false); } await CallOnTokenUpdate(authTokens.access_token, authTokens.refresh_token, DateTime.UtcNow.AddSeconds(authTokens.expires_in)); await Account.GetEndpoint().ConfigureAwait(false); return(true); }