I use my web app and Terminal API to create checkouts on my Square Terminal. Is there a way or workaround to print an ID number, such as Reference_Id, Customer_Id, or Order_Id, using the Terminal’s built-in printer? Alternatively, can these ID numbers be added to existing receipts? (I am planning to use this number to identify the owner of the next prepared order)
At this time the ability to do custom print jobs on the Terminal isn’t currently possible. 