!!!1. Sharepoint Microsoft Graph REST API based integration.\\

Go to the the Microsoft azure portal: [https://azure.microsoft.com/en-us/features/azure-portal]/\\
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__Application registration: __Go to the App registrations and click on New registration:\\
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[attachments|new_registration.png]\\
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Name it. Select the Multitenant and personal Microsoft accounts type. The redirect url must ends with :register_microsoft_graph_api/. Then click on register.\\
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[attachments|register_app.png]
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__API permission :__ You also need to provide permission for the Microsoft Graph. Go to the Api permission. Click on Add permission, select Microsoft Graph. Choose Delegated permission and add the "Files.ReadWrite.All" permission:\\
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[attachments|permission_microsoft_graph.png]\\
[attachments|permission_final.png]\\
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__Client id : __ You can find it at Azure portal -> App Registration -> Overview:\\  
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[attachments|client_id.png]\\
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__Secret key :__ A new client secret needs to be created as well. Go to the "Certificate & secrets" and generate a new secret key. Click on New client secret:\\
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[attachments|new_secret.png]\\