1. Shopify Discounts and Stackable Coupon Codes: If a Shopify coupon code or default discount is applied, it will not combine with a stackable coupon code. Only the Shopify coupon code will be used in this case.

2. App Discounts and Stackable Coupon Codes: When using discounts created through our app, a stackable coupon code can be combined with these app-level discounts for additional savings.