Hi @Olivier, welcome to the community 
, we are so excited to have you here with us.
That’s really awesome. The following article might be of interest to you:
This is an in-depth guide exploring Atlas App Services including:
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App Services Authentication
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Atlas GraphQL API and Custom Resolvers
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Atlas Functions
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App Services Static Hosting (by deploying a Single Page Application(React.js)) etc.
Thanks and Regards.
Sourabh Bagrecha,
MongoDB