I remember visiting Canada shortly after that had started there. Do they round up and down? It seems like it was always rounded in the customer’s favor, but I don’t remember. With this approach here, it could penalize customers for using cash, even if it’s only a few cents at a time.

Just standard rounding. From my experience in retail it's a wash money wise. The tills reported the variance due to this and it was minor pocket change daily, positive some days, negative on others. 70% pay with tap anyways.