client.agents # create, list, get, update, delete
client.numbers # buy, list, get, attach, reassign, release (destructive)
client.calls # create, list, get, get_transcript, hangup, push_context
client.messages # send, list, list_conversations
client.events # poll, peek
client.webhooks # list, set, delete, test
client.billing # get_balance, get_expenditure, get_summary, ...
client.voice # list, get, set, reset