If you'd like your Users to pay for their invoices before the billing date, you can configure your invoicing setting to set User invoices as 'Overdue' immediately after they're finalized.
Click on Settings from the left-hand menu
Select Features then Invoicing
Click Invoice policy and select Immediately overdue under 'Choose how long before invoices become overdue'
Click Payment policy and enable the Allow Users to pay invoices before they are due toggle under 'Decide if Users can pay invoices early'
Click User communications and Select how many days before the due date you'd like to send a link to your Users to the upcoming pending invoices
You can also restrict User access when Users have unpaid overdue invoices under their accounts. Click here to learn more about this option.
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