public async Task <Webhook> CreateUrlWebhookAsync(Uri url, params Webhook.WebhookEventType[] eventTypes)
        {
            String encodeParams = new UrlEncoder().EncodeObject(new
            {
                url         = url.AbsoluteUri,
                event_types = UrlEncoder.ConvertEventsArr(eventTypes)
            });

            return(await createAsync(null, encodeParams));
        }
        public async Task <Webhook> CreateEmailWebhookAsync(String email, Webhook.WebhookEventType[] eventTypes)
        {
            String encodeParams = new UrlEncoder().EncodeObject(new
            {
                email       = email,
                event_types = UrlEncoder.ConvertEventsArr(eventTypes)
            });

            return(await createAsync(null, encodeParams));
        }