What is the "card number" of a debit card?

 feel quite silly asking this. I have to fill in a form to pay for something and it requires my card number. I know this is the 16 digit number on the front of the card. However, in the form, there is an additional 3 digit space at the end. Am I meant to fill that in with the three numbers from the signature strip / do three different numbers go in / do I not fill it in at all?
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