static async Task AddSubscriptionAsync(TwitterContext twitterCtx) { ulong webhookID = GetWebhook(); try { AccountActivity accAct = await twitterCtx.AddAccountActivitySubscriptionAsync(webhookID); Console.WriteLine("Subscription added."); } catch (TwitterQueryException tqEx) // Twitter returns a 3XX or 4XX when it can't add, which throws { Console.WriteLine($"Unable to add subscription: {tqEx.Message}"); } }