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Sam's Club has been doing similar for the last year[0], as well. They already have a built-in "check your receipt at the door" flow that customers are used to,

• geekamongus 10y ago
  I used this for the first time two days ago. I was pleasantly surprised, and it felt really awesome --almost to a point of guilt-- skipping the checkout lines. However, once I reached the exit where the man was inspecting receipts, things screeched to a halt. I showed him the bar code on my phone, and he looked at it, exclaiming, "Oh no, Scan and Go. You used Scan and Go." He then turned to find a powered-off scanning device that he couldn't get to start up, as he muttered, "I wish they'd never started that." I replied, "As a customer, I love it." He had to call over a manager, who used her scanner to scan my barcode, blindly scroll through my purchased items list to get to the green button, and declared me good to go. Meanwhile, I had held up all the people trying to exit behind me. It was still faster than checking out, but hopefully they get proper training for their employees implemented.