generate_barcode
Generate barcode
Use this when the user wants a barcode generator: a UPC or EAN-13 barcode for a product, a Code 128 barcode for a SKU or label, GS1-128 with (01) GTIN, (17) expiry and (10) lot, Code 39, an ITF-14 carton code, or a book ISBN barcode. Computes or verifies the check digit (explains a wrong one), applies GS1 quiet zones and sizes, and returns SVG and PNG download links plus calculated print dimensions. One barcode per request; Code 128 up to 80 characters, Code 39 up to 60 characters, and GS1-128 up to 48 data characters including separator FNC1 characters. Does not issue or register GS1 numbers (real UPC/EAN numbers must be licensed from GS1), does not scan images or look up products. Do not use for QR codes.
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