{ "content": { "avatar_url": null, "displayname": "example", "membership": "join" }, "event_id": "$151800140517rfvjc:localhost", "membership": "join", "origin_server_ts": 1518001405556, "sender": "@example:localhost", "state_key": "@example:localhost", "type": "m.room.member", "unsigned": { "age": 2970366338, "replaces_state": "$151800111315tsynI:localhost", "prev_content": { "avatar_url": null, "displayname": "example", "membership": "invite" } } }