Add a configurable product to a cart [Web API Tutorial] - magento/inventory GitHub Wiki

To add a configurable product to a cart, you must provide SKU, the quantity, ..., and the quote ID, which was generated when the cart was created. But first, you need to have the product in the inventory. If you already have one then copy and modify payload to fulfil the requirements otherwise we assume that you followed these instructions to Create a configurable product with REST API on MSI. The following example adds a Configurable Product MSM 1 to the cart.