What payment terms are used when issuing an invoice?
This article explains how to set payment terms for your customers when you create an invoice, including how to set default payment terms, and how to override the default and set payment terms manually.
You can decide the payment terms (the number of days until payment is due from your customer) within each of your Invoicing Profiles - learn more about how to set up your Invoicing Profiles.
The image below shows how to set your default payment terms:

When you create an invoice, you can choose either to use the default options set within your profile, or to set the payment terms manually for the individual invoice.

To help you better understand the invoicing module as a whole, please visit the module overview page here.