If your customers pay early you might want to reward them with a special "early payment discount". You will not only need to communicate this to them in the invoice but also earlier on when offering a service. 

Check out the example on which options you have here: 7.5.2.1 Activate Early Payment Discount for Quotes and Invoices.

You start by creating a "Terms of Payment" record. Navigate to the Terms of Payment object using the App Launcher and click on New to create a new record:

Enter a good name for the record

Make sure that if you enter data for 

Click on save.

This record will now be referenced in your Account and Media Campaign. And it automatically set the values for the above mentioned fields. 

Option 1: Select the Terms of Payment in your Account record and select this account as Debtor in your Media Campaign. The following bullet points describe the behavior:

Option 2: Select the Terms of Payment directly in your Media Campaign.

This will result in the following on your PDFs: