I'm trying to send call data out to a webhook but I have no idea how to reference the data associated to a call in the configuration for the Data Action.
If you're wanting to use a default value for the conversationId, it should be adding it as a default as long as you click the check mark at the top right corner of the field being edited when you're done editing. You can check the test tab and the default value should autopopulate. I've tested and confirmed that behavior in a data action.