API - questions about webhooks

Hi, I have two questions about webhooks:

1. Documentation says "Register for an HTTP event (such as "contacts_post")" (https://mycloud.act.com/act/Help/Api/POST-api-Webhooks). Where can I find this events list? I need event for contact update.

2. To delete webhook, ID is needed (https://mycloud.act.com/act/Help/Api/DELETE-api-Webhooks-id). How can I get ID of a webhook. "GET /api/Webhooks" (https://mycloud.act.com/act/Help/Api/GET-api-Webhooks) does not return ID-s. ID is returned when webhook is created, but how can I delete existing webhooks?

Thanks!