1. Sharepoint Microsoft Graph REST API based integration.
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Go to the the Microsoft azure portal: https://azure.microsoft.com/en-us/features/azure-portal/

Application registration: Go to the App registrations and click on New registration:



Name it. Select the Multitenant and personal Microsoft accounts type. The redirect url must ends with :register_microsoft_graph_api/. Then click on register.


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:




Client id : You can find it at Azure portal -> App Registration -> Overview:



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: