Member flags combined as a bitfield
OptionalidThe id of the thread
This field is omitted on the member sent within each thread in the GUILD_CREATE event
An ISO8601 timestamp for when the member last joined
OptionalmemberAdditional information about the user
This field is omitted on the member sent within each thread in the GUILD_CREATE event
This field is only present when with_member is set to true when calling List Thread Members or Get Thread Member
Optionaluser_The id of the member
This field is omitted on the member sent within each thread in the GUILD_CREATE event
See
https://discord.com/developers/docs/resources/channel#thread-member-object-thread-member-structure