Communities now have the ability to create and maintain Payment Terms. Common Payment Terms like NET30 (payment required in 30 days) or 20M (payment due on the 20th of each Month) can be configured at a community and a supplier level. 

Once setup, the default Payment Term will appear on any supplier or integration created invoices, and be available for selection on Invoices you create.

Payment Terms can also be specified per Supplier on the new Settings tab.