{
  "phase": "preview",
  "input": {
    "actionId": "hub.user.block",
    "assistantRole": "admin",
    "membershipRole": "client_admin",
    "actorUserId": "user_root",
    "targetUserId": "user_silver_psih",
    "confirmed": true,
    "idempotencyKey": "example:caller:block:user_silver_psih"
  }
}