Barcode
The barcode identifies the product sold at retail. It is usually a long number and not useful for production-date decoding.
Batch code
The batch code is normally shorter, printed or embossed on box, bottle, tube, label edge, or jar base.
What to enter
Choose the brand and enter the shortest complete production-like string, preserving letters and leading zeroes.
Shade code, SKU, serial number, and product reference
A shade code identifies a color; a SKU or product reference identifies the item sold; a serial or registry number may identify a package or filing. None of these automatically identifies the production lot.
Use the separate short string printed, stamped, embossed, or laser-marked on the original box or container. Preserve letters and leading zeroes.
A practical package check
Start with the barcode area only to rule it out, then inspect the box flap, bottle or jar base, tube crimp, label edge, and small stickers. Compare outer and inner codes without joining them.
If two codes differ, keep both exactly as printed and use the box-and-bottle guide. A plausible code can support production context but cannot prove authenticity.