Slack
Invite Testery App to a Private Slack Channel
In order for Testery to send alerts to a channel, the Testery bot must be invited. There are several ways to do this in Slack, but the easiest is to @-mention the Testery app.
For example, you can send something like this to the channel,
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When you send a message to @Testery and the app isn't invited to the channel yet, you'll get a notice to invite the app's bot to the channel.
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Click Invite Them, and now Testery will be able to send alerts to that channel.