Where can the Pin MessageId be found?

[TAINCER]

When I send a new Message in a slash command, I want to remove the Pin Message after setting the Pin.
Since the Pin function doesn't return the MessageId for the Pin Message, I don't see how I can do this in the command function.

Example:

let test_message =
    ctx.send(|d| d.embed(|e| e.title("Test Message"))).await?;

let message = test_message.message().await?;

message.pin(ctx.http()).await?;
// Remove Pin Message?

[arqunis]

You can using the message collector. Discord does not return data for the generated system message, since that's an action that is separate from pinning. Instead, you'll have to listen to incoming messages with the PinAdd message type:

use serenity::model::channel::MessageType;

let channel_id = message.channel_id;

if let Some(pin_msg) = channel_id.await_reply(ctx).filter(|m| m.kind == MessageType::PinAdd).await {
  pin_msg.delete(ctx).await;
}

[TAINCER]

How should I use this? If I await_reply after I pin the Message, the Collector won't catch the Pin Event. otherwise, if I first await_reply and then try to Pin the Message, the Collector will await until somewhere else a Pin is created.
I would like to put this in a separate Thread, but I can't clone the ctx.