How to limit a product so a customer can only buy one single unit.

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We are using a product listing for an app called just uno. Basically customer gets a freebie for signing up for SMS & email. The app adds the free product to their cart automatically. Customers can increase the quantity in their cart though - I want it to be a one time purchase per customer. 



Replies 2 (2)

Shopify Staff
1725 146 309

Hi, @jennifer-mj!


Thank you so much for sharing your question with our network.


From what you have described it sounds as though the app is successfully adding the free product to your customer's cart, but it is not limiting the quantity of said free item?


If so, that is definitely something that will need to be investigated further. In this case, since you are using a third-party app the best resource for support with functionality will be the creators behind the app. Learn how to contact your App's Developer directly for personalized assistance. 


To speed things up for you, I also found their contact email for you here:


I trust that helps, but let us know if you have further questions.

Warm regards,

Olivia | Social Care @ Shopify 
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Shopify Partner
1811 143 189

Hi @jennifer-mj ,


this can be implemented using the custom dev in the theme.


We will add a tag on sign up of the user now whenever user login or not have placed any order your sample product will be added automatically and this item will not have option of edit or change the quantity.


The only option the item will have is delete. Let me know if interested in, details are in post footer.

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