ClearSubChannelMessagesParams

// Clear sub-channel specified When time Before message (Local only)
val params = ClearSubChannelMessagesParams(timestamp = System.currentTimeMillis() - 86400000)
subChannel.clearMessages(params) { error ->
    if (error == null) {
        // Cleared successfully
    }
}

// Clear sub-channel specified When time Before message (Local + Remote)
val params = ClearSubChannelMessagesParams(
    timestamp = System.currentTimeMillis() - 86400000,
    policy = MessageOperationPolicy.LOCAL_REMOTE
)
subChannel.clearMessages(params) { error ->
    // ...
}