If you’ve opted to include Label Messages in your Printing Setup, it helps to know where the message will appear on the UPS shipping label.
Please visit our page How can I add order information to my labels? for information on how to include these Label Messages (for example, an Order Number, SKU, or custom message).
On most UPS shipping labels, there are two available fields where you can insert label messages. Both fields are named Trx Ref No. on the bottom of the UPS label. Label Message #1 will appear on the top field called Trx Ref No., and Messages #2 and #3 will appear side by side on the bottom Trx Ref No. The Trx Ref No. field character limit is 35.
NOTE: UPS Mail Innovations, SurePost, and international labels do not support label messages.