Use API to send unattended chat notifications from Windows Dataflex

Using chilkat example-code for dataflex and zoom api We are attempting to send simple internal Zoom Chat notifications from an unattended Windows pc on our network to an individual team chat user using Dataflex. We have successfully created & activated a server-to-server oAuth2 app in the zoom marketplace. We can use those credentials in Dataflex to gain Zoom API access which will return a URL. However…

When we load the URL via code to a browser the error returned (using localhost no matter what port we use) is Invalid redirect: So our questions at this point are:

  1. how do we solve this (google chrome) browser response error?
  2. is this necessary for the simple task we are attempting? Must we obtain oAuth2 authorization?
  3. Must we create & save a local token?
  4. Must we use that local token in our POST
  5. Where might we find more guidance to accomplish this?

That NOT being in place returns a Code 124 “Invalid Access Token” which seems to point to this all being required. Thanks for the possibilities…