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The final result looks like the following:
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More Advanced Messages
Note that you can also pass a json string to the MICROSOFTTEAMS.sendTeamsWebhookMessage function which allows you to send more advanced messages. The json string just needs to conform to Teams Adaptive Card Schema.
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Authoring Adaptive Cards
Both the MICROSOFTTEAMS helper and Plugin Operations support passing a json string which allows the full Adaptive Card schema to be leveraged.
Microsoft provides a webpage to view the schema and a playground to create your own messages, which can be found below.
https://adaptivecards.io/explorer/AdaptiveCard.html
https://adaptivecards.io/designer/
Setting up Certificates
You may need to install the certificate for https://graph.microsoft.com/.default into your Java keystore. If this is the case, you will get an error about building a certificate path.