Invoices created in PoS will be processed based on the Due Plan Settings by default. Editing the due date for an invoice can be done when creating the charge for the order.
Click Point of Sale > Sales from the left navigation menu.
Add the desired product(s) to the Sales Cart.
When ready to charge, navigate to the Sales Cart and click Charge Now.
Click Find Account.
Search for and select the account. Click Continue.
Click the Invoice tab.
Click the pencil icon to the right of the due date.
Choose the new due date using the calendar.
Click Create Charge.