json_error: Error("unknown variant `member_joined_channel`, expected one of `message`, `app_home_opened`, `app_mention`, `app_uninstalled`, `link_shared`, `emoji_changed`", line: 0, column: 0),
json_body: Some(
"{\"envelope_id\":\"f75fbe8a-a4eb-4666-***-439f0986c1fe\",\"payload\":{\"token\":\"***\",\"team_id\":\"T04N165GK0T\",\"context_team_id\":\"***\",\"context_enterprise_id\":null,\"api_app_id\":\"***\",\"event\":{\"type\":\"member_joined_channel\",\"user\":\"U04NDV8606M\",\"channel\":\"C04NR0SQBRN\",\"channel_type\":\"C\",\"team\":\"***\",\"inviter\":\"U04NR0GHBGQ\",\"event_ts\":\"1677093519.000500\"},\"type\":\"event_callback\",\"event_id\":\"Ev04QDN07G23\",\"event_time\":1677093519,\"authorizations\":[{\"enterprise_id\":null,\"team_id\":\"***\",\"user_id\":\"U04NDV8606M\",\"is_bot\":true,\"is_enterprise_install\":false}],\"is_ext_shared_channel\":false,\"event_context\":\"4-***\"},\"type\":\"events_api\",\"accepts_response_payload\":false,\"retry_attempt\":0,\"retry_reason\":\"\"}",
),