Possible issues with Shopify Functions discounts on POS?

Shopify Apps

Topic summary

Main issue: Discounts built with Shopify Functions (custom discount logic) apply correctly on the Online Store but often fail on Shopify POS (point‑of‑sale) for some merchants.

Recent reports: Multiple merchants have reported the problem to an app developer. Another merchant confirms: a discount created a day ago works on the website but not on POS, while older discounts (created over a week ago) work on both POS and website.

Observed pattern: Failure appears tied to newly created discounts on POS, not to the Online Store. The same codebase is used across channels, suggesting a POS/channel-specific handling issue rather than app logic.

Impact: Inconsistent behavior on POS makes it difficult to explain and support affected merchants.

Requested details: The original poster asks what specific information would help diagnose the issue.

Status: No root cause or workaround identified; discussion remains open with unresolved questions about why POS handles these discounts inconsistently.

Summarized with AI on January 5. AI used: gpt-5.
1

Anybody else noticing issues with Shopify Functions discounts on POS?

I’ve received multiple reports from merchants recently of discounts not being applied on POS.

But it works for these merchants on the Online Store, and it is the exact same code… :thinking:

(I’m not ruling out entirely that it could be an issue in my code, but if it is, then it wouldn’t make sense for it to work perfectly in the Online Store, but not on a different sales channel.)

Please let me know if there are any specific details you need me to include to make it easier to diagnose what is going on.

Thanks,
Tobe

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Hi there,

We are having that exact problem at the moment.

The discount code that we created a day ago works flawlessly on our website, but after many attempts doesn’t work on POS.

We’ve tried discount codes that were created more than a week ago, and they work fine on POS and website.

3

Thanks for confirming that you’re running into this issue - I was concerned I was the only one.

It’s hard to explain this issue to merchants, when it’s not even clear what the issue is, besides “Shopify POS inconsistently handles Shopify Functions discounts.”

1 Like