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By default, a Shopify cart applies one discount at a time. The Combinations card in Galantis Discount Flow lets a campaign opt in to stacking with other discounts, using the same combination system Shopify applies to its native discounts. Getting combinations right matters twice over: too restrictive and a customer’s free-shipping code silently cancels your sale price; too permissive and discounts pile up beyond what you budgeted.

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The Combinations card

The card appears in step 3 of the creation wizard and on the campaign detail page. Under the heading “This discount can be combined with:” are three checkboxes:
  • Order discounts — discounts applied to the whole order total
  • Product discounts — discounts applied to specific products or cart lines
  • Shipping discounts — free or reduced shipping
Each checkbox corresponds to one of Shopify’s discount classes. Ticking a class means your campaign is willing to apply alongside discounts of that class — leaving all three unticked means the campaign never stacks with anything.
The Combinations card with the three discount class checkboxes
Combination is mutual. Your campaign stacks with another discount only when both sides allow the other’s class — your settings alone can’t force stacking with a discount that doesn’t permit it.

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The best-discount rule on shared lines

There is one rule that combination settings cannot override: on the same cart line, only the best product discount applies among competing product discounts. Two product discounts can coexist in one cart — each applying to different lines — but where they both target the same line, the customer gets the better of the two, not both.

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Scenarios

A 20% storewide campaign runs alongside a free-shipping campaign for carts over 150.Tick Shipping discounts on the percentage campaign and Product discounts on the free-shipping campaign. A qualifying cart then gets both: 20% off the products and free delivery. If either side leaves the other’s class unticked, only one of the two applies.
Review combinations before every major sale. Stacked discounts multiply quickly — a 30% campaign combining with a 20% order discount gives away far more margin than either does alone.

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Quick reference