How to send & get attributes from cart in Checkout UI Extension

[miguel_caro]

I'm working on the creation of a checkout UI Shopify extension, to show a banner that displays information of some hidden inputs that we add on the add/cart form.

Is it possible to send information to the shopping cart from the storefront, and then be able to consume it in a checkout UI app to display it in a Banner?

I noticed that by using the useApi() Hook I can get some information on the checkout and cart line items, could I get the information that Shopify sent from the add/cart in this same hook? 

Or how can I do this on the Checkout UI App Extension?

Payload from add/cart

_subscription_filter_selection: #######123

_subscription_filter_interval: 15

_subscription_available_intervals: 6,9,12,15

_subscription_available_unit: month

_subscription_filter_date: 03-13-2025

_subscription_filter_price: $89.10

_subscription_filter_title: Product Title

_subscription_filter_unit: month

[wes007]

Hi there, I was wondering if you made any progress with your app that you were developing? We are looking for a way to display Cart attributes that are collected on the Cart page, during the Checkout process after we move to Checkout extensibility.