Packaging brand: $45K/year recovered from stacked discount codes
A $5M B2B+DTC packaging brand on Shopify Plus had 7 active promo codes, but 9% of orders carried two stacked against policy. 
Halia flagged the stack rate; the team tightened code combination rules and recovered $3,850/month.
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9% of orders had two promo codes stacked. Policy said one.
Seven active codes — sitewide, volume tiers, AM-issued, loyalty, two free-ship rules. Customers were stacking codes the policy didn’t allow, and the extra discount layer was invisible until monthly P&L close.
How this brand found their $45,000.
$5M packaging brand, B2B and DTC on Shopify Plus.
Seven active promo codes ran concurrently: sitewide, volume tiers, AM-issued, loyalty and two free-ship rules. Policy was one code per order.
Halia joined Shopify discounts with order line items.
Surfaced that 9% of orders carried two codes at checkout — most common stack: sitewide + AM-issued, eating 4.2% of orders alone.
The ops team audited the code library.
Two codes had no exclusion rules in Shopify; one AM-issued code had a typo letting it stack. The policy doc said “one code per order” but the storefront never enforced it.
Tightened the rules, retired the duplicates.
Set Shopify discount combinations to exclusive only; deactivated 2 redundant codes; consolidated AM-issued into a tiered structure. $3,850/month recovered; Halia watches for new stacks.
From data connection to $3,850/month confirmed in 30 days.
Halia surfaced the discount stacking the day she connected; the policy-drift detector keeps watching every new code that goes live.
Halia joined Shopify discount metadata with order checkout data and flagged the stack-rate the second it breached the “one code per order” policy baseline.— From the operator engagement notesFind this exact leak on your store in 5 minutes.
Connect your stack — Halia surfaces where your margin is leaking before the monthly P&L close.
You probably have a version of this leak.
If any of these signals match your discount operation, the same pattern is likely already costing you margin.
Multiple active codes
You run 4+ promo codes at once across sitewide, loyalty, AM-issued, and seasonal — exclusions managed manually.
B2B + DTC together
Both channels run on the same storefront, with sales-issued discount codes alongside automated promotions.
Policy doc, not enforced
Your “one code per order” policy lives in a doc, not in Shopify discount combination settings.
Margin only at close
Discount-layer impact only shows up at month-end P&L — by then 30 days of margin has shipped.
Questions operators ask about stacked discounts.
Why doesn’t Shopify catch this?
Shopify Plus supports discount combination rules, but they default to “combine with others” on automatic discounts and don’t enforce a policy across all 7 codes unless each one is configured. AM-issued codes created on the fly often skip the exclusion config entirely.
How does Halia know which combinations are allowed?
Halia reads your discount policy (configured once) and joins it to live order checkout data. When an order has a code combination outside the policy, it alerts you with the stack rate, the codes involved, and the realised overage so you can fix the rule in Shopify directly.
Is $11 per order really $45K/year?
For a $5M brand at ~4,200 orders/month: 9% stack rate = ~378 affected orders/month. At ~$11 avg extra discount per stacked order, that’s ~$4,150/month — or about $50K/year before policy fixes. Net realised recovery after rule changes was ~$3,850/month or $45K annualised.
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