curl --request POST \
  --url http://localhost:3000/v1/rfc-picks/{id}/assign-cart \
  --header 'Content-Type: application/json' \
  --data '
{
  "cart_id": "012000000100001000"
}
'

{
  "success": true,
  "cart": "<unknown>",
  "message": "<string>",
  "error": "<string>"
}