Get the account context for this connection: the signed-in user, the organization this token operates on, its subscription plan and limits, digest notification settings, and whether this connection holds the write scope (write_access). Use it to confirm which account and organization the connection acts on. A null plan means the organization has no paid subscription; billing_url is where the user subscribes or upgrades. On a read-only connection, new_monitor_url and settings_url are the handoff links for setup and preferences.