GTIN Check Digit

ID Key Format Number (without Check Digit)   Check Digit GTIN  
GTIN-8
GTIN-12
GTIN-13
GTIN-14

GLN Check Digit

ID Key Format Number (without Check Digit)   Check Digit GLN  
GLN

SSCC Check Digit

ID Key Format Number(without Check Digit)   Check Digit SSCC  
SSCC