Why can't I use multiple promo codes on Shopify?

Shopify Apps
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Topic summary

Merchant cannot stack two promotions at checkout: (1) a bundle deal when customers select two items, and (2) a free item when spending over a threshold. Despite using the paid “all-in-1 discount in cart” app and marking codes as combinable, only one applies and customers must choose.

Reply requests key details affecting stackability: whether these are discount codes or automatic discounts, and whether they are product, order, or shipping discounts (and if both are the same type). The responder links Shopify’s “Discount combinations” documentation, noting that combination rules vary by discount type and setup.

Suggested approach: review Shopify’s discount-combination rules to verify eligibility based on discount types; if the goal is a bundle offer, consider using a dedicated bundle app rather than plain discounts.

Outcome/status: No resolution yet. Action items: clarify discount types and formats, consult the official combination rules, and potentially switch to a bundles app. The linked help article is central to resolving the issue.

Summarized with AI on January 1. AI used: gpt-5.
2

Hi Ambientcandle19,

  1. Are these discount codes, or automatic discounts?
  2. Are these product discounts, order discounts, or shipping discounts? Are both discounts the same type?

I would recommend reading Shopify’s “Discount combinations” article, which explains all the rules for combining discounts:

https://help.shopify.com/en/manual/discounts/combining-discounts/discount-combinations

Depending on your answers to 1 and 2, it might make it clear why you’re not able to use more than 1 promo code at a time.

Also, if you’re trying to set up a bundle offer, then you might be better off using a bundle app, instead of just plain discounts.

Best,

Tobe