@Benny_Chan@bkspace and @Liam-Shopify, we’re stuck on a very similar case where one of our merchants need to use the Cart Transform API on the POS touchpoint.
We got it setup to run on specific retail locations through the latest 2025-07 API and using the variable retailLocation from the input query.
It works for the most part as expected, however there were a few discrepancies we noticed as shown in the below video
Adding the child products to the cart on the POS with the respective quantities does not increase the bundle quantity (it remains fixed at 1)
In the Shopify checkout, though - the parent bundle quantity gets updated to 2 as expected.