The attach_to property accepts a message id. So, if you were replying to a webhook, you can use that message's id as the attach_to property. The clients that support this, will make sure that the notification you send is attached to the message you're responding to.
...from the beginning. We have built up a lot of content in HipChat, with it being a core tool in our distributed company model. While it is true that we didn’t need to move to Slack immediately, we felt it...
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