I have a client with a particular project of blocking the purchase of a "special item" to only 1 per order.

The user cannot purchase another item in conjunction with this special item, so if the user wants another product, will need to make another purchase?

  • What are the benefits of having this?

  • This will disrupt for sure the basket-checkout flow?

  • User will get piss off?

  • How any system can insure to block users with different accounts, or cards but with the same address or even different address?

  • or is a good sale if a user purchases the item 10x on 10 different orders?

I totally disagree with this approach of penalizing the user and the experience or the flow because of only 1 item. I don't see any retailer following that technique.

Any ideas, suggestion or own experiences or similar? I'll appreciate all your help.

  • 1
    Maybe it is a special discount that the client doesn't want the customer to take advantage of. Why don't you ask your client? What is your question specifically? How to implement such a restriction in an online shop?
    – Nash
    Commented Dec 4, 2020 at 14:06
  • It would be helpful to understand why your client doesn't want to make additional money - what are the constraints causing this requirement?
    – Izquierdo
    Commented Jan 4, 2022 at 23:11
  • Incredible. If I were to be served with this at any site I probably just wouldn't bother and leave immediately. Commented Aug 28, 2023 at 2:39

2 Answers 2


I don't know if this will be work

  • If user want two products (a normal and special), will have to pay to cargo, rate, two times
  • Pay two times can make the user give up the purchase
  • The user project your knowledge about other sites in our sites, change the experience about this, for me is not usual and cool.

To solve this problem, I recommend investigate with the main users.


This is exactly the point of UX! If we left everything to client, developer, or stakeholder opinions tech would be terrible.

I don't think you can get an answer to any of your questions above here. None of us know why your client is even asking for this, let alone the benefits or whether it would be a good sale if the user came back and ordered again, or what the most logical blocking criteria would be.

I would recommend seeing if you can get your client and any other stakeholders to sit down for a quick Rose, Bud, Thorn activity. You already have a bunch of thorns outlined above but don't serve those up immediately, guide your participants to think of them. Make sure to focus on Buds! I think running through that with your client could result in designing a much better solution.

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