Slack URL
Generate an "Incoming WebHook" URL from the apps configuration page on Slack. This URL can be changed on a per-project basis by creating a project custom field named "Slack URL" (without quotes).
Slack Channel
The channel can be changed on a per-project basis by creating a project custom field named "Slack Channel" (without quotes). For public channels, this value should start with a #.
Slack Icon
Slack Username
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