curl --request POST \
  --url {protocol}://{host}/wp-json/cocart/v2/cart/add-items \
  --header 'Content-Type: application/json' \
  --data '
{
  "items": [
    {
      "id": "<string>",
      "quantity": "1",
      "variation": {},
      "item_data": {}
    }
  ],
  "email": "jsmith@example.com",
  "phone": "<string>",
  "return_items": false
}
'

[
  {
    "item_key": "<string>",
    "id": 123,
    "name": "<string>",
    "title": "<string>",
    "price": "<string>",
    "quantity": {
      "value": 123,
      "min_purchase": 123,
      "max_purchase": 123
    },
    "totals": {
      "subtotal": 123,
      "subtotal_tax": 123,
      "total": 123,
      "tax": 123
    },
    "slug": "<string>",
    "meta": {
      "product_type": "<string>",
      "sku": "<string>",
      "dimensions": {
        "length": "<string>",
        "width": "<string>",
        "height": "<string>",
        "unit": "<string>"
      },
      "weight": "<string>",
      "variation": {}
    },
    "backorders": "<string>",
    "cart_item_data": {},
    "featured_image": "<string>"
  }
]