If you're using Bulk Discounts and monitoring your codes usage, you may want to see which codes have and have not been used. We have purposefully not built this into our app as it is already built-in to the Shopify Admin Discount area.
1. Open Shopify and click Discounts on the left menu
2. Click the name of the Discount Set you want to look at
3. At the top, under Discount codes, click View All Codes
4. Look at the Used column to see how many times the code has been used. If the code has no limit, it will show as a single digit; if the code has a limit, it will show in the following format: 1/2