Create or update a webhook on a Typeform form via the Webhooks API

Documented steps

1. Auth: Authorization: Bearer {access_token} — personal access token or OAuth token with webhooks:write scope.
2. Call PUT https://api.typeform.com/forms/{form_id}/webhooks/{tag} — `tag` is a unique name you choose; it is the webhook's identifier for later retrieve/update/delete.
3. Body fields: `url` (HTTPS destination), `enabled` (bool), `secret` (optional HMAC signing key), `verify_ssl` (bool), `event_types` (e.g. {"form_response": true, "form_response_partial": true}).
4. Example: curl -X PUT https://api.typeform.com/forms/{form_id}/webhooks/{tag} -H 'Authorization: Bearer {token}' -H 'Content-Type: application/json' -d '{"enabled":true,"url":"https://example.com/hook"}'
5. PUT is idempotent by tag: repeating the call with the same form_id/tag updates the webhook instead of creating a duplicate.
6. Success returns 200 with the full webhook object (created_at, enabled, event_types, form_id, id, tag, updated_at, url, verify_ssl).
7. Official docs: https://www.typeform.com/developers/webhooks/reference/create-or-update-webhook/ ; https://www.typeform.com/developers/webhooks/