delete https://sandbox-api.onsched.com/setup/v1/locations//email/templates/
Use this endpoint to Delete a Custom Email Template that was previously created. A valid business location id and email templateName are required. Deleting a custom email template will revert the template back to its default originally created by OnSched. Changes will be reflected in all business locations associated with this company.
The email template endpoints work a little differently than most. When you delete you are deleting the custom template you created, and the original default Email Template created by OnSched will be reactivated.