How does the next paragraph end?

How to reissue an invoice
Identify what information has changed.
For example, someone might have increased their order, or you made a mistake on the original invoice. Go down through each piece of information on the invoice and look for changes to any of the following :
Client information amount due payment deadline description of goods or services provided
Correct the invoice.
Go into your invoicing software and update whatever information needs to be changed. You should change the invoice number so that it reflects that it has been revised.