// src/actions/types/list.php - Get Timeline Event Templates
$hubSpot->crm()->timeline()->templatesApi()
    ->getAll('HubSpot Application ID')

// src/actions/types/delete.php - Delete a timeline Event Template
$hubSpot->crm()->timeline()->templatesApi()
    ->archive('Event Template ID', 'HubSpot Application ID');

ID	Name	Object	Actions