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}");
            }
        }