I moved on to another job before integrating though now Avanan has put out more documentation and gone through a few software updates. The documents are now public. The relevant information to integrate can be found here. Avanan published a two part guide. Then the integration in Splunk would be with the Splunk AWS app or similar if using Splunk cloud.
https://www.avanan.com/manuals/splunk-integration-part-one
https://www.avanan.com/manuals/splunk-integration-part-two
https://splunkbase.splunk.com/app/1274/
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