Update a Line Item

Updates a *Checkout Line Item*. Updates an existing, single line item in the cart. If a variant needs to be changed or updated, the product will need to be removed and re-added to the cart with the correct variants using the [Add Cart Line Items](/docs/rest-storefront/carts/cart-items#add-cart-line-items) endpoint or the [GraphQL Storefront API](/docs/storefront/cart-checkout/guide/graphql-storefront). > #### Notes > * Substitute your storefront domain for `yourstore.example.com`. > * The ...