How to get token from Outlook to Peoplesoft Absence management through code

How to get token from Outlook to Peoplesoft Absence management through code, the Service we created is not a provider and there is no Handler tab.

The token is created successfully in Create OAuth2 Service Apps but how we get authorization token through code , we are using Azure oAuth2.0.

How to post absence date and time in Outlook calendar for each Emplid.

We want to get token , add calendar and delete calendar as and when absences created in Peoplesoft 51 image and tools 8.61.

Thanks

Venkata Sharma