Reorder Flash Listings

curl --request PUT \
  --url http://localhost:3000/api/flash/reorder \
  --header 'Content-Type: application/json' \
  --data '
{
  "flashUpdates": [
    {
      "id": "<string>",
      "order": 123
    }
  ]
}
'

{
  "success": true
}