Webex - Post Message to Room

Posts a message to a Webex room. You can provide a plain text message, a message with markdown, an attachment, or a combination of these.

Target: Webex integration target or an HTTP Endpoint for "webexapis.com" with no path

Account Key: None if using an integration-provided target, access token if using an HTTP endpoint target

Steps:
[] Build the JSON payload
[] Validate that message content was provided
[] Build the authorization header
[] Send the request to the Webex API
[] Check if the request was successful and set the output variables

More information about this API: https://developer.webex.com/docs/api/v1/messages/create-a-message