matrix-spec/data/event-schemas/examples/m.room.member$join_authorised_via_users_server.yaml

{
  "$ref": "m.room.member.yaml",
  "content": {
    "membership": "join",
    "avatar_url": "mxc://example.org/SEsfnsuifSDFSSEF",
    "displayname": "Alice Margatroid",
    "join_authorised_via_users_server": "@bob:other.example.org"
  },
  "unsigned": {
    "age": 1234
  }
}