Module rest 

Microsoft Graph REST API, mirroring the reference resource tree. The mail and contacts surfaces hang off the users resource (/me or /users/{id}): mail folders, messages, the sendMail action, contact folders and contacts. JSON batching ($batch) sits beside it, at the API root.

https://learn.microsoft.com/en-us/graph/api/overview

Modules

batch

Combine several Microsoft Graph requests into one HTTP call (POST /$batch).

users

Microsoft Graph user resource (users, or the me shortcut), including its mail folders, messages, the sendMail action, contact folders, contacts, calendars and events.