Step by step information has been given in this article -
Also In the qa-external-users.php file in the qa-external folder there are many examples are available .
Follow up with these , definitely you can set it up and running .
As suggested by maxjtechno in below comment -
you could give a try to this video . :)
Good Luck :)
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April 20, 2021: Q2A 1.8.6 released!