Depending on the number of products packaged in the primary packaging, the barcode could be EAN13 (1 single product) or EAN14 (several products)
In EAN14 barcode:

• The first digit is the "Logistic Variant", also named as "Packaging indicator".
• The next 12 digits are representing the product number. General this the EAN-13 number without the check digit.
• The last digit is the check digit. ActiveBarcode calculates this digit automatically

More information on barcode: https://www.activebarcode.com/codes/ean14.html
Last digit calculation: https://www.gs1.org/services/check-digit-calculator

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