I try to use a Drupal 8 installation, with GraphQl and to use Simple Oauth for authentication.
However, I am not able to find a recent guide that explains how to configure this.
I tried to create a new resource for GraphQl in Simple Oauth and a new Consumer, but I do not seem to be able to generate token for this Consumer using Postman, as there is always an error : "Client authentication failed" even if I followed the guide on Simple Oauth module page.
Is there an up-to-date tutorial on how to setup Oauth authentication for being able to do queries on <site_url>/graphql?
Thank you very much for your help