ReadonlyactionOptional Readonlyupdatefalse to update only the Prices and TaxRates of the Line Items. Prices inside the variant are only updated if updateProductData is true.
true to update the Product data (such as name, variant, productType, and Product Attributes) of the Line Items.
This update action does not set any Cart field in particular, but it triggers several Cart updates to bring prices and discounts to the latest state. Those can become stale over time when no Cart updates have been performed for a while and prices on related Products have changed in the meanwhile.