Discount codes created by your other apps default to not combining. CombineSync groups them by the app that made them and applies the settings you choose.

• Groups discounts by the app that created them, from Shopify's own record
• Set what each app's discounts combine with: product, order and shipping
• Read-only until you switch an app on, so nothing changes without your say-so
• Works with code and automatic discounts, including Buy X Get Y and shipping
• Activity log of every change, skip and failure, with before and after states