curl --request POST \
  --url https://api.flare.io/firework/v2/tenants/{tenant_id}/users \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "users": [
    {
      "user_id": 123,
      "is_readonly": true,
      "role": "viewer"
    }
  ]
}
'

This response has no body data.