Add Host as cc/bcc when payment request sent

We allow guests to make 2 payments, 50% at booking and 50% 14 days before check-in. Often the guest does not pay the second payment on time and there’s no way for the host to know if the email actually went out or not. I suggest adding the host email as cc or bcc so they have a copy that the invoice was indeed submitted to the guest. Send a notification in both cases when the invoice is sent and when the payment fails. In addition, it would be great to send an invoice 7 days before the due date to give the guests some time to make the payment.