Glossary
What is a coupon? E-commerce definition
June 4, 2026
A coupon (discount coupon, often translated as discount voucher) is a conditional commercial benefit granted to the buyer: percentage discount, fixed amount, free delivery, or free product, in exchange for compliance with rules (dates, minimum basket, eligible products). In e-commerce, the coupon is most often in the form of a promo code entered at checkout or applied via an automatic link.
Summary
Definition: coupon, voucher, discount code
The term coupon comes from physical retail (paper coupons cut out of newspapers). Online, it refers to the same principle: a right to a discount activated by an action (entering a code, clicking a link, scanning a QR).
Common forms are structured around several complementary elements.
Digital coupon: email or SMS code (WELCOME10). Automatic coupon: discount applied without entry via URL /discount/CODE. Unique coupon: generated for one customer (1 use).
Public coupon: same code for everyone (SOLDES30). Partner coupon: influencer, affiliate, press.
Useful distinctions.
Coupon: vs discount voucher: coupon = Anglo-Saxon term; discount voucher = common French formulation. Close meaning in e-commerce. Coupon: vs promo code: the coupon is the marketing benefit; the promo code is the technical string entered. Often interchangeable. Coupon: vs discount: discount = backend rule (Shopify Discount); coupon = offer perceived on the customer side.
Merchant coupon: vs manufacturer coupon: in retail, the manufacturer sometimes reimburses the merchant; in DTC Shopify, the merchant assumes the discount. Coupon: vs gift card: the card is a prepaid credit; the coupon reduces the price. Coupon: vs slashed price: open promotion on the product sheet with no code required.
Why coupons matter in e-commerce
Coupons remain one of the most universal levers to convert and retain customers, but if poorly managed, they can cannibalize margins.
Conversion: unlocking a purchase (welcome offer, cart abandonment). Attribution: coupon code by channel (PODCAST15, META20). AOV: "$15 off from $100" encourages adding more items to the cart.
Loyalty: birthday coupon, loyalty tier. Seasonality: BFCM, sales, launches. Competition: buyers compare available coupons before purchasing.
Major risk: coupon leakage. A VIP coupon found on an aggregator site (Honey, RetailMeNot, deal forums) can be used massively and erode the margin (gross profit). Strategy: targeted coupons, limited duration, unique codes.
Coupon types and commercial uses
Online coupon ecosystem.
Email / SMS: personalized post-purchase or win-back coupon. Browser extensions: automatically suggest codes at checkout (friction or conversion depending on the case). Aggregator sites: list public codes, sometimes obsolete.
Ads: "Use coupon SAVE20" in Meta/Google creatives. Packaging: paper coupon insert with QR code to the store.
Coupon discount types: %, fixed amount, free shipping, Buy X Get Y (Shopify).
Coupons on Shopify
Shopify uses the label Discount codes in the admin, which is the functional equivalent of e-commerce coupons.
Creation: Admin > Discounts > Create discount > Discount code (Shopify Help Center).
Key settings are structured around several complementary elements.
Value (%, fixed, shipping, BXGY). Eligible products/collections. Minimum order, customer eligibility (first order, segment).
Usage limits total and per customer. Combinations with other discounts. Start/end dates.
Coupon application without entry: URL https://boutique.com/discount/CODE redirects and applies the discount to the cart. Apps (ReCharge, Smile.io, Klaviyo) generate dynamic coupons for subscriptions and loyalty.
Checkout: standard "Discount code" field. Shopify Plus allows for layout customization. Hiding the field reduces opportunistic coupon usage but frustrates legitimate customers.
Points of vigilance to protect the margin
Objective per coupon: acquisition, recover cart, AOV, loyalty; measure separately. Unique codes: for sensitive offers (leakage prevention). Usage limit: on public and influencer coupons.
Test rules: cart minimum, exclusions, stacking. Align communication: banner, email, consistent checkout. Deactivate: expired or compromised coupons immediately.
Simulate margin: before aggressive coupon campaign.
In brief
Coupon: = conditional discount advantage (Anglo-Saxon term, common in e-commerce). FR equivalent: bon de réduction (discount voucher); technical: promo code / discount code. Levers: conversion, AOV, attribution, loyalty; risk: leakage and margin.
Shopify: Discount codes, /discount/CODE link, discount reports. Targeted, limited, measured coupons; avoid generalized permanent promotions.
Associated terms, FAQ, and going further
Associated Terms
Promo code: technical input of the coupon. Discount coupon: French equivalent. Discount: underlying Shopify rule.
Cart abandonment: coupon recover context. Conversion: target of targeted coupons.
FAQ
Coupon and promo code: the same thing?
In e-commerce practice, yes in the majority of cases. The coupon refers to the marketing offer; the promo code is the string entered to activate it.
What does Shopify call coupons?
In the admin: Discount codes. Checkout customer-side: "Discount code" or "Promo code" depending on the theme translation.
How to limit coupon leakage?
Unique codes per customer, short duration, global cap, eligible segments, no permanent public coupon on the entire catalog.
Can a coupon be applied via a link?
Yes: https://yourstore.com/discount/CODE applies the discount to the cart on Shopify (redirection based on configuration).
Go further
Pricing and margin strategies. Abandoned cart emails with coupon. Optimize checkout.
Marketing automation. Return to the Qstomy e-commerce glossary.
Sources: Shopify Help Center (Discount codes), retail and e-commerce promotional practices (DGCCRF, price transparency).
Enzo
13 May 2026
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