Let's take one example when I initiate exchange of coins using eXch simplex bot, and in that moment bot stops working for some reason (development, update, etc.).
Yeah, I get it.
It's really simple - when you create an exchange and complete the payment, the bot essentially disconnects/turn off. After that, nothing else is required from the bot because the exchange was initiated through it, but the API directly sent the
'X-Requested-With': 'XMLHttpRequest' to eXch. All the magic of the exchange happens on their end.
In the rare case that something goes wrong, the worst that could happen is that you won't receive a notification from the bot. However, your exchange will still go through without any issues.
Plus, if you've already completed the payment, you'll have a direct link to the order and a guarantee letter in your chat history.
This bot is just a bridge between private chat and eXch.
Note that you will have to verify and get approved by admin for your eXch affiliate ID, before you can make a withdrawal from your account

Oh, I definitely didn't know that, thanks for telling me about it.