Get Webhook
Credential material is never returned.
secret_key, auth_config and
request_headers are all accepted on create and update, and all omitted from
this response. request_headers counts as credential material because KnoxCall
spreads those headers into the outbound delivery request alongside the
Authorization header derived from auth_config — a value stored there is
indistinguishable from a destination API key. To change a header, send the new
value on PATCH /v1/webhooks/:id; to stop sending one, send a
request_headers object without it.