How can I set automatic payments on Paypal?

To setup automatic payments from Paypal you need to setup a Paypal subscription.

To do this, login to the client area, go to the pending invoice and click on the Paypal subscription button. The button only shows when the invoice is not overdue, so make sure you do this as soon as you get the new invoice notification.

Once you setup the subscription, new invoices will get paid automatically as long as Paypal accepts the transaction.