curl --request POST \
  --url http://localhost:3000/v1/scanner/carts \
  --header 'Content-Type: application/json' \
  --data '
{
  "cart_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "order_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
}
'

{
  "success": true,
  "order": {
    "id": "<string>",
    "display_id": 123
  },
  "cart": null
}