Update Cart Line Item

Updates a *Cart* line item. Updates an existing, single line item quantity and the price of custom items in a cart. If a modified product or variant needs to be changed or updated, you can remove and re-add the product to the cart with the correct variants using the [Delete Cart Line Item](/docs/rest-storefront/carts/cart-items#delete-cart-line-item) and the [Add Cart Line Items](/docs/rest-storefront/carts/cart-items#add-cart-line-items) endpoints. You can also use carts mutations that are ...