curl --request POST \
  --url https://production.runalloy.com/users/batch \
  --header 'Authorization: <authorization>' \
  --header 'Content-Type: application/json' \
  --header 'x-api-version: <x-api-version>' \
  --data '{
  "users": [
    {
      "username": "demo@runalloy.com",
      "fullName": "Gregg Mojica"
    }
  ]
}'

{
  "message": "success",
  "invalidUsers": [
    {
      "fullName": "Missing Username"
    },
    {
      "username": "alreadyexists123"
    }
  ]
}