{
  "kind": "payload_envelope",
  "expect": "valid",
  "description": "side_channel_context placement with required acceptable placement",
  "data": {
    "schema_version": "lifeloop.v0.2",
    "payload_id": "pay-side-1",
    "client_id": "thread-sync-publisher",
    "payload_kind": "thread_sync_post",
    "format": "client-defined",
    "content_encoding": "utf8",
    "body": "side channel body",
    "byte_size": 17,
    "acceptable_placements": [
      { "placement": "side_channel_context", "requirement": "required" }
    ]
  }
}
