The parts of a broadcast form a message that lays its own form out arranges.
Readonly
The mutation token: the form's client_context, mutation_token and offline_threading_id.
client_context
mutation_token
offline_threading_id
The target's own fields (thread_ids, recipient_users, …).
thread_ids
recipient_users
The parts of a broadcast form a message that lays its own form out arranges.