As I interact more and more with the POS UI Extensions, I’ve been noticing some inconsistencies in how it works versus what is documented and specially with the new testing package and mocks, trying to replicate real world POS becomes hard given the types are not what we expect. A few examples I’ve…

Hey @dsnvs :waving_hand: thanks for flagging this and sharing these specific examples. I’m digging into this further. I’ll follow up here once I have more information to share.

Thanks for your patience while I dug into this @dsnvs . I see what you mean with both of these examples here and we’re looking into making adjustments to our docs. I’ll follow up in this thread when I have more to share. Regarding overall improvements to the documentation any types, a more complete…

Cart API docs and package types are incorrect

Extensions

dsnvs July 27, 2026, 8:03pm 4

@Wes-Dev-Shopify Thanks!

While at it, maybe also check: [BUG] LineItem.discount[].amount returns fixed amount for discount with percentage type

Topic		Replies	Views
Selected Product Variant not displayed in Cart Extensions pos-extensions	20	417	August 26, 2026
UI-Extensions POS Cart API: Add multiple line items with same variantId Extensions pos-extensions	11	321	January 13, 2026
[POS] Products that are not available for POS, can be added to cart via POS Extensions Cart API Extensions pos-extensions	1	109	December 16, 2024
Feature request: updateLineItemQuantity in the POS UI Extensions Cart AP Extensions pos-extensions	2	57	September 2, 2026
Documentation missing for bulkCartUpdate input Extensions pos-extensions	3	161	March 7, 2025

Cart API docs and package types are incorrect

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