ITF-14 (also known as SCC-14) barcodes are casually referred to as Case Codes and are used on cartons, cases and pallets of retail products. They are a shorter version of a GS1-128 and contain only the GTIN and are used when the code is directly printed on the surface such as cardboard and requires less detail to be scanned by the lasers. The items inside the containers should have UPC or EAN barcodes on each item.
For information on how GTINs work, see the GS1 document here.
Make sure you give us your numbers in the Order Notes box on the checkout page or send them to us via email.