Does Cart Transform lineUpdate (price modification) work on Basic plan stores with a public App Store app?

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  1. I’m building a public Shopify app for product options (similar to Bold Product Options). The app uses Cart Transform with the lineUpdate operation to adjust line item prices based on customer-selected options (size, flavor, etc.). I’ve tested on a development store created through the Dev Dashboard (“Test an app or theme” purpose, Basic plan). The Cart Transform function is activated, executes correctly, reads line item attributes, and returns a valid lineUpdate operation with fixedPricePerUnit. However, Shopify rejects the operation with:

    update_feature_not_available: The update operation feature is not accessible for the given shop.

    My specific question: Once this app is approved and published on the Shopify App Store, will lineUpdate work when a merchant on the Basic plan ($39/month) installs it? I spoke with Shopify support who confirmed that “public apps built with Shopify Functions can work on Basic plan stores” but could not confirm whether lineUpdate specifically is available on Basic through a public app. The documentation states the update operation is restricted on Plus trial stores but doesn’t clearly address public apps on Basic.

  2. This is a critical business decision for us. If lineUpdate doesn’t work for public apps on Basic, we need to know before investing in the App Store submission process. Technical details:

    • Target: cart.transform.run

    • API version: 2026-01

    • Operation: lineUpdate with fixedPricePerUnit

    • Dev store plan: Basic App Development (partnerDevelopment: true)

    • App distribution: Public (not custom)

    Has anyone successfully used lineUpdate in a public app installed on a Basic plan production store?

    Looking for any advice on this from anyone who has experience with this?

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You need Plus regardless of app distribution type for the update operations.