curl --request PATCH \
  --url http://staging.qshop.ng/apiv2/shops/{shopId}/cart/{cartId}/ \
  --header 'Content-Type: application/json' \
  --data '
{
  "items": [
    {
      "_id": "<string>",
      "name": "<string>",
      "qty": 123,
      "variant": {
        "_id": "<string>"
      }
    }
  ],
  "email": "<string>"
}
'

{
  "msg": "<string>",
  "data": null,
  "success": true
}