itemId identifies the product or product variant to add. For more complex maniputation with orders, see /orders endpoint.curl --location '/cart/items/PR1245451254' \
--header 'Authorization: Bearer JWT' \
--header 'Content-Type: application/json' \
--data '{
"quantity": 2,
"clientContactId": "1245451254",
"permId": "263d7733-b8f5-4f62-9330-525702be7be7"
}'{
"items": [
{
"itemId": "PR1245451254",
"quantity": 2
}
]
}