Open Active Defender into the account with the School ID you have configured to CAP Notification in Tecastic Digital Signage.  Your rep likely already configured the Tecastic side.  This will walk you through the Active Defender Setup.

Click Settings

Click Administrate Group and Login with Admin Credentials

Once in Click Alerts and Reports

The Click Rest API

Paste the following URL into the Text Box for the Endpoint

https://flow.zoho.com/741009511/flow/webhook/incoming?zapikey=1001.f5e25f2aab276e841990e6d16885d342.818704105e10f746017688a1ac58265f&isdebug=false

Turn on all of the Notifications and customize the verbiage as you please. (If you have chosen to have custom images displayed the text here does not matter.  This is not typical)