Hi @Maria
You can send a notification of payment to your clients, but it will only send the email to the main contact on the account. What may be an idea is to have the finance department as the main contact, which means they would also receive the overdue reminders too.
There’s more info on sending this notification here
There isn’t a way of sending a “deleted payment” email at the moment. I’m not sure what the use case would be for this - perhaps you could explain how you would use this, and we may be able to suggest an alternative way of working it?