I know that with estimates the customer can accept the estimate if they have a portal login. We do not use and do not want to use portal logins. Is there any automated way to get customer acceptance? For example, ideally it would send the customer a Zoho Sign link along with the estimate, but I haven't found any way to get Zoho Books to collect a signature on estimates (other than the portal, which we don't use).

Is there any way to get Zoho Books to send out a Zoho Sign link to collect a signature along with the estimate? Or there any other way to collect a signature besides using the portal?