Notification emails when new customers are created and/or make their first order

We're using the commerce feature of our squarespace site and sell products that are available as weekly, fortnightly or monthly deliveries.

I'd like to be notified when there is a new customer, but currently the only notifications we get are for "A New Order has Arrived".  As each repeat delivery is a new order, I'm getting inundated with new order emails, but have no idea when one of these refers to a new customer.

How can I be notified when a new customer has signed up and makes their first order?

Yes I have the same problem. I've been asking for 18 months for Squaresapce to make editable admin notification email templates but they wont do it. Others have been asking for 2 years. You cant even customize an order email subject *per individual product*.  Its a fundamental requirement for manageable ecommerce yet Squarespace seem to consider it some kind of 'nice to have feature'. I'll be leaving the platform soon on this basis.