I haven't used this App Service yet myself, but to use it you import the service from the appstore to one of your modules. In a microflow, when choosing the action type you should see the App Service at the bottom of the list of action types. Choose it there, pass a file document to it and you should get some output (string?) back for further processing
Thank you David. Tried doing the same and was not successful, hence requested example in this case. It would help if someone could provide more information along with example in using the document parser utility.