Are there mapping docs that have what endpoints or operations in the UIs/APIs relate to the listed activity and objects?
The following webhook events for securlet
You can refer to following github link for API/Payload details of each of this monitored event
https://docs.github.com/webhooks-and-events/webhooks/webhook-events-and-payloads#webhook-payload-object-common-properties
We also make call to following APIs
https://docs.github.com/en/rest/orgs/webhooks?apiVersion=2022-11-28#create-an-organization-webhook
https://docs.github.com/en/rest/orgs/orgs?apiVersion=2022-11-28#get-an-organization
https://docs.github.com/en/rest/orgs/members?apiVersion=2022-11-28#list-organization-members
https://docs.github.com/en/rest/orgs/webhooks?apiVersion=2022-11-28#list-organization-webhooks
https://docs.github.com/en/rest/repos/repos?apiVersion=2022-11-28#list-organization-repositories
This API list is not final and can change in future when we add new features.