@Angelo Oliveira Thanks for reaching out. You can refer to Azure API Management REST API reference for the list of operation groups that are supported.
Individual APIs documents will list the operation that is supported and their respective document can provide more details on the usage of that particular API.
Let's say if you want to create the API then you can refer to this Apis - Create Or Update document and it will provide you with details on the endpoint/API you have to call along with the request parameter, request header, request body, responses, etc. You can also test the API with Try It
option on the individual page and create the request as per the document.
To get started on how the authorization header is generated and how to Register your client application with Azure AD along with the permission you can refer to Azure REST API reference document.
Feel free to get back to me if you need any assistance.
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