How KOR Helped a Shopify Store Offer 15 Free Samples While Allowing Only One per Customer
Running a free-sample campaign on Shopify sounds simple: give customers several options and let them choose one.
But what happens when your store offers 15 different sample flavors and customers can add multiple flavors to the same cart?
That was exactly the challenge faced by one Shopify merchant. The merchant wanted customers to choose one free sample from 15 available flavors, pay only for shipping, and still have the ability to purchase other products in the same order.
The challenge required more than simply setting a maximum quantity of one on each individual product. The restriction needed to work across multiple sample products and variants.
This is where KOR Order Limits Quantity helped solve the problem.
The Customer's Free Sample Campaign
The merchant wanted to create a promotional campaign around free product samples.
The campaign had three basic requirements:
Customers could choose from 15 different flavors.
Each customer could receive only one sample.
Customers would pay for shipping but could add other products to the same order.
At first glance, this might seem like a straightforward maximum-quantity rule.
However, there was an important complication.
If a maximum quantity of one was applied individually to each sample product, a customer could potentially select one flavor, then add another flavor, and continue adding samples.
For example:
Although each product individually had a quantity of one, the customer could still end up with multiple samples.
The merchant needed the restriction to apply across the available sample options, not simply to each product separately.
The Initial Problem
The merchant had already configured quantity restrictions, but customers were still able to add multiple sample flavors.
The KOR support and technical team investigated the configuration and identified that the required setting had not been enabled.
Once the appropriate setting was enabled, the quantity restriction began working as intended.
This highlights an important point when implementing Shopify purchase restrictions: setting a quantity limit is only part of the configuration. The rule also needs to be applied at the correct level.
Configuring One Sample Across 15 Flavors
The 15 sample products were configured with the following rules:
Minimum Quantity: 1
Maximum Quantity: 1
Limit Across Variants: Enabled
The critical part was applying the restriction across the available options.
Instead of treating each flavor as a completely independent purchase, the configuration ensured that the customer could select only one sample.
For example:
Allowed:
Chocolate Sample → 1
Not allowed:
Chocolate Sample → 1
Vanilla Sample → 1
This type of setup is particularly useful for promotional campaigns where merchants want to give customers a choice without allowing them to claim every available option.
KOR supports minimum and maximum quantity rules at product and variant levels, along with collection-specific and other purchase-limit rules.
The Problem Didn't End With Quantity Limits
After the quantity restriction was working correctly, the merchant encountered another issue.
The sample product was displaying a "Buy It Now" button instead of the standard "Add to Cart" button.
This created a problem for the promotional campaign.
The merchant wanted customers to:
Select one free sample.
Add the sample to their cart.
Continue shopping.
Add other products.
Complete everything in one order.
The "Buy It Now" option could bypass the normal cart-shopping flow and prevent the sample from being combined with other products in the way the merchant intended.
So the technical issue wasn't only about quantity limits anymore. It also involved the store's product-page configuration and cart behavior.
How the KOR Team Resolved the Cart Issue
The KOR team investigated the merchant's Shopify theme and product-page configuration.
The expected product files were not immediately available in the theme structure, so the team requested Shopify collaborator access to investigate the implementation more closely.
After accessing the relevant theme files, the development team implemented the required changes and tested the product-page behavior.
The goal was to ensure that the sample could be added to the regular Shopify cart rather than forcing customers directly into checkout.
After the fix, customers could add the free sample to their cart and continue shopping for other products.
This was important because the promotional campaign was not intended to be a standalone checkout. The sample needed to work as part of a normal shopping journey.
What About Customers Who Want the Free Sample Again?
The merchant also had another important question:
Could a returning customer claim the free sample again?
This depends on how the merchant wants to structure the promotion.
For some campaigns, allowing customers to claim a sample repeatedly may be acceptable.
For others, the promotion may be intended as a one-time sample offer.
KOR provides purchase-frequency and time-based limit capabilities that can be used to control repeat purchasing behavior. Its current feature set includes time-based limits, purchase frequency, and customer-specific rules.
This gives merchants flexibility to define promotional rules according to their campaign requirements.
For example, a merchant could structure a promotion around:
One sample per customer.
One sample within a specific period.
A lifetime purchase restriction.
Different limits for different customer groups.
The exact configuration depends on the campaign structure and customer-identification requirements.
The Final Solution
After addressing both the quantity restriction and product-page/cart issue, the merchant was able to run the free-sample campaign as intended.
The final setup allowed customers to:
Choose from 15 flavors → Select one sample → Add it to the cart → Continue shopping → Purchase other products
The merchant also had the flexibility to manage repeat sample claims using purchase-limit settings.
Campaign Requirements vs. Solution
Why Cross-Product Restrictions Matter for Shopify Promotions
This case demonstrates why promotional quantity limits can be more complicated than simply setting a maximum quantity.
Consider a store running promotions such as:
Choose 1 free sample from 10 flavors
Select 1 free gift from a collection
Buy one item and choose one complimentary product
Claim one trial-size product
Choose one promotional variant
One limited-edition item per customer
In these situations, merchants may need to control the combined quantity across multiple products or variants.
Without the right restriction, shoppers may be able to select several options even when each individual product has its own maximum quantity.
KOR is designed to support these types of purchase-control scenarios across products, variants, collections, carts, customer tags, order amounts, weights, and other conditions.
KOR for More Than Free Samples
Although this customer case focused on a free-sample promotion, the same type of purchase-limit functionality can be useful for many Shopify business models.
B2B and Wholesale Stores
Wholesale merchants often need minimum order quantities or specific purchasing rules for different customer groups.
KOR supports MOQ and customer-tag-based purchasing restrictions for wholesale use cases.
Limited-Stock Products
If a product has limited availability, merchants can set maximum purchase quantities to help control how much a customer can order.
Product Launches
For a new or highly limited product, a merchant may want to restrict each customer to a specific quantity.
Promotional Gifts
Stores running "choose one free gift" promotions can use purchase restrictions to prevent customers from adding multiple promotional items.
Bulk and Wholesale Orders
Merchants selling products in packs or requiring minimum quantities can use quantity and multiple-purchase rules to align orders with their business model.
A Small Configuration Can Solve a Complex Customer Journey
The free-sample campaign appeared simple from the customer's perspective:
Choose one sample and pay for shipping.
Behind that simple experience, however, several requirements had to work together:
Multiple sample products
Multiple flavors
Quantity restrictions
Cross-variant control
Product-page behavior
Add-to-cart functionality
Compatibility with additional products
Repeat-customer restrictions
The KOR team worked through the configuration and theme-related issue to make the complete customer journey work as intended.
That is one of the practical benefits of having both purchase-limit functionality and technical support available when implementing more complex Shopify promotions.
Conclusion
A free-sample promotion can become complicated when customers need to choose from multiple products while being restricted to a single sample.
In this case, a Shopify merchant wanted to offer 15 different flavors while allowing only one sample per customer/order. KOR helped implement the appropriate quantity restriction, prevent customers from selecting multiple sample options, and resolve the product-page issue that was preventing the sample from being added to the regular cart.
The result was a smoother promotional shopping experience:
15 choices. One sample. One cart. More flexibility for the merchant.
For Shopify merchants looking to control product quantities, minimum orders, customer purchasing limits, collection restrictions, or promotional purchases, KOR Order Limits Quantity provides a flexible way to build these rules without changing the core shopping experience. The app currently offers a 7-day free trial, with plans starting at $3.99/month.
FAQ Section
(1) Can I limit customers to one free sample on Shopify?
Yes. A Shopify purchase-limit app can be used to set a maximum quantity and apply the restriction across relevant products or variants, depending on how the promotion is configured.
(2) How can I offer multiple free sample flavors but allow only one selection?
Configure the sample products under an appropriate quantity rule and enable the setting that applies the limit across the relevant variants or options.
(3) Can Shopify customers add a free sample and other products to the same cart?
Yes, provided the sample product uses the regular cart flow rather than a direct checkout configuration such as a "Buy It Now" button.
(4) Can I prevent customers from claiming a free sample repeatedly?
Purchase-frequency or time-based restrictions can be used to control repeat purchases or claims, depending on the merchant's campaign requirements.
(5) Can KOR Order Limits be used for wholesale stores?
Yes. KOR supports minimum order quantities, customer-tag-based rules, product and collection limits, and other purchasing restrictions designed for wholesale and B2B scenarios.
(6) What other Shopify purchase limits can KOR create?
KOR supports rules based on products, variants, collections, carts, order amounts, weight, time, purchase frequency, and customer tags, along with checkout alerts and customized messages.
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