Use check digit in a sentence. The check digit method was used to add an additional layer of customized security to our products and business services offered. You can figure out a good way to use a check digit to make your codes much harder to crack. 14 people found this helpful. The check digit would be added later, because that is how it worked, and I knew this because I had studied it before.
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Clicking either the GET COUPON or the SHOW DEAL button takes you to the store website. 1  Browse products and add items to your cart after reading about the product, features, sizing and delivery details. 2  Click the brown bag icon to continue. 3  Enter your shipping info, choose your method of payment and pay securely.