Unfortunately even new performance insights is still at very basic level of reporting, so we have to use external BI tool to do all our analysis on mailings. But current APIs are combersome and there is no API to report on mailings sent from Programs which is the primary tool for us. Manual workaround with 'i' below is manual and non-scalable.

Neither there is a way to know what exact message was sent to a recepient with all dynamic content and personalizations used, so hopefully this request can be used to expand APIs in general.

https://www.ibm.com/support/knowledgecenter/SSWU4L/Automation/imc_Automation/Automation_q_a_watson_assistant/Program_reporting_workaround.html

Support response:

"Unfortunately, there is not an API that will provide mailing metric details for mailings that are in a WCA Program. To view those specific details, the Program Workaround article I provide is the way to view specific mailing metrics."