EAN 13 check digit

[aminemarckader]

Good morning, please I would like to note that I can't find a way to generate a check digit to add it to the database and the label. I tried 123456789012 as a barcode and when displaying the label I only get the 12 digits without the check digit included. Please, can you add a method to get it or include it directly in the label. THANKS IN ADVANCE.