I am adding some items in my cart passing the selling_plan props and everything works fine till here.
But i need to either remove it from some items in the cart or add it using the /cart/update.js or /cart/change.js endpoints.
Can anyone give me some light how to reach such result?
A customer add a item without selling_plan to the cart and after the item is added, the same customer wants now to subscribe to this item so i have to pass the selling plan id to this item that is already in the cart. the inverse situation is also needed.
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