OverlayIQ LogoOverlayIQ

Shopify app · Margin recovery

Recover the Margin You're Losing to Repeat Discount Abuse.

OverlayIQ blocks repeat discount usage at checkout using device fingerprinting, address matching, and behavioral signals — without hurting real customer conversion.

Run a Free Leakage AuditSee How It Works
OverlayIQ margin recovery dashboard — discount leakage and recovered margin metricsFree promo leakage audit — see your margin recovery opportunity
Works with Shopify CheckoutInstalls in under 5 minutesNo code required
Invalid discount message at checkout — repeat use blocked

Your Discounts Are Leaking.

Most merchants rely on "one per email" or "first order only." That's easy to bypass with aliases, temp mail, and new accounts. Most tools act after the order — so you still pay fees and do refunds.

Repeat use of first-time codes

One person, many accounts, same welcome or single-use code.

Post-order only

Flag then cancel or refund — no prevention at checkout.

OverlayIQ stops repeat discount use at checkout, so you keep margin and avoid the operational headache.

How You Recover Margin

Automated enforcement at checkout, with optional post-purchase flagging for your team.

Step 1

Detect repeat users across accounts

Device fingerprinting, fuzzy address matching, and IP intelligence so one person can't reuse first-time or single-use codes with a new email.

Step 2

Validate discounts at checkout

Via Shopify Functions we validate the moment a code is applied. If we detect a repeat user, we show a clear message — no order created, no fees, no refunds.

Step 3

Block at checkout or flag after purchase

Prefer not to stop the checkout? Let the order complete and we'll flag it for manual review in your admin so your team can cancel, adjust, or refund according to your policy—without silently changing the discount the customer saw at checkout.

Step 4

See exactly what you saved

Monthly recovered margin report so you know your promo budget is working for real new customers.

Built for How You Run Promos

First-time codes, referral programs, influencer offers.

First-time buyer / welcome code

One person, many accounts, same code. We block repeat use at checkout or flag the order for review after purchase so only true first-time customers keep the offer.

Referral program leakage

Self-referrals, same household. We flag or block based on device, address, and behavior so referral rewards go to real new customers.

Influencer & single-use codes

Codes shared or reused. We enforce at checkout so margin goes to real new customers and your promo budget stays efficient.

What 2–5% Margin Recovery Looks Like

Estimated avoidable discount leakage at 3% of revenue.

Monthly revenue3% leakageRecovered
$500,000$15,000$15,000
$1,000,000$30,000$30,000
$2,000,000$60,000$60,000

From Leakage to Recovered Margin

"

We were leaking thousands a month on repeat first-time codes. OverlayIQ caught it at checkout so we never created the orders. Our margin report now shows exactly what we're saving.

— Head of Growth, DTC Brand

Run a Free Leakage Audit

Frequently Asked Questions

Common questions about blocking repeat discount abuse and recovering margin on Shopify.

What is OverlayIQ?
OverlayIQ is a Shopify app that blocks repeat discount and welcome code abuse at checkout. It uses device fingerprinting, address matching, and behavioral signals to detect when the same person is reusing a first-time or single-use code, then validates at checkout via Shopify Functions so no order is created and you keep your margin.
How does OverlayIQ stop repeat discount use?
When a customer applies a discount code at checkout, OverlayIQ checks whether that device, address, or behavior has been linked to a previous order or code use. If we detect a repeat user, you can block the code before the order is completed, or allow the order and have it flagged for manual review afterward—your choice. Blocking avoids fees and refunds on those checkouts; flagged orders can be handled with your existing post-purchase workflow.
Does it work with Shopify Checkout?
Yes. OverlayIQ runs at checkout using Shopify Functions, so it works with Shopify’s native checkout. No custom checkout or third-party checkout replacement is required. It installs in under 5 minutes.
Do I need Shopify Plus?
No. Shopify Plus is not required. Public apps can ship Shopify Functions that run at Shopify checkout when you install from the App Store—so discount validation works without Plus. Use a standard Shopify plan with native checkout; if you are on an older or limited plan, confirm with Shopify that checkout app extensions are supported for your store.
Will it hurt conversion for real first-time customers?
No. We’re built to minimize false positives. We only flag or block when we have strong signals (device, address, IP, behavior) that the same person is reusing a code. Real new customers are not affected.
What’s a promo leakage audit?
A free audit we run to estimate how much margin you’re losing to repeat discount use (e.g. welcome codes, referral codes). We’ll show you the opportunity and how OverlayIQ can recover it. No commitment required.
Who is OverlayIQ for?
DTC brands on Shopify (typically $1M–$20M revenue) that run first-time buyer discounts, referral programs, or influencer codes and want to protect their promo budget and recover margin—with automated checkout enforcement and optional post-purchase flagging when you want a human in the loop.