Bot ID on MM Web App
On Creation of a bot account via Mattermost Web UI, you won't be able to see the Bot ID. But when you create a BOT via Mattermost API, you will get an ID in response that's a BOTID. Hence, this request is for showing the BotID you get when creating a Bot Account via Mattermost UI.
Why is this needed?
Consider a bot wants to send a direct message to an user. For that a new channel has to be created via API. For that to happen, user_ids of the 2 users should be passed in while creating a new channel.