If you plan on printing packing slips from the Portal (we generate the packing slip), see this article for more information:
https://bbqguys.logicbroker.com/hc/en-us/articles/360026375712-Downloading-Packing-Slips
If you plan on generating the packing slip in your system, see this article for the specifications & requirements:
https://bbqguys.logicbroker.com/hc/en-us/articles/360023062151-Packing-Slip-Specification