Where can I find an item key?

Each item added to the cart has it’s on item key and when you get the cart response, you will need to look under the object called items.

There you will then need to cycle through the items to find the one you want.

Each item will have it’s own item key.

You can use the item key to update, remove or restore the item in/from the cart.

"items": [
    {
      "item_key": "1ad001efb8a576ded17c71534502f4a5",
      "id": 73,
    ...
}