Slack App Events

You need to set up event receiver in your app. Go to the Event Subscriptions subpage of your Slack app page. You will get a page like this:

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On this page, after enabling events reception by the app, there are two crucial elements that you need to fill:

• Request URL - this is the URL in Jira, that Slack will call when an event happens. 

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  Use the Event Request URL value from the Enabling Slack Integration page to fill this:

• In the Event Subscriptions section, under Subscribe to events on behalf of users, select event types to subscribe to. Click the Add Workspace Event button to select the message.channels event type:

• click Save Changes button at the bottom.