Pre Arrival Review System (PARS) are affixed to the A8A document used for importing goods into Canada. They contain a 4-digit carrier code (assigned by the CCRA), the word PARS (optional) and a 6 or 8 digit consecutive number assigned by the manufacturer of the goods for shipment tracking.
Pre Arrival Processing System (PAPS) is a bar coded label system used to expedite the clearance of goods into the U.S. The labels are sequentially numbered in pairs. One pair is required for each transaction at the U.S. border.