Shoppers are now able to add up to two coupon codes at checkout.
If we run a sale, you can use one of your existing coupons or loyalty rewards plus the sale coupon. You may also use a coupon, and if you spend over $100, get an automatic coupon added for free shipping, no code needed. Not applicable on multiple rep codes.
Note that this new feature is a third-party app, and the two codes must be entered in the Cart, before clicking checkout. If you try to enter them on the Checkout page, it will only allow for one code due to Shopify's native settings.