UPDATE ......Confluence has now been updated to version 9.2.6. Please see following page for details and feedback about changes:
Updates
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The Webhook of note is the ServiceNow one: https://geant.slack.com/services/B2WV0SY20 . The setup of this webhook can be found at: https://geant.slack.com/services/B2WV0SY20#service_setup
The source code for the servicenow REST Web Service can be found here: https://git.geant.net/gitlab/src/servicenow/tree/master/org/geant/servicenow. Specifically the ServiceNowConnector.java file, which demonstrates how to create a message and write it to a particular SLACK channel.