Use Stamps.com in your QuickBooks software –
No need to re-enter your data!
The Stamps.com QuickBooks App allows QuickBooks users to use the functions of Stamps.com within the QuickBooks interface. Print postage and addresses for your invoices, sales orders, or any other transactions from QuickBooks directly on envelopes or labels. Simply open the invoice (or other transaction) in QuickBooks and click on “Print Envelopes” or “Print Packages.”