Stamps.com allows you to add a custom message that will print on your shipping labels. This is a great way to add a personal touch to your label or add information to the label that is required in your shipping workflow.
In Stamps.com Online, enable the Print Reference # option and enter your desired text into the Reference # field.
If you are using Stamps.com PC software, enter your desired text into the Print Message field before you print your postage.
Your message or reference number will be printed on the bottom of your shipping label.