An Application Server ABAP can access services offered by external service providers, for example, SAP HANA Cloud Platform, as an OAuth 2.0 client on behalf of end users.
The AS ABAP takes on the role of an OAuth 2.0 client and acts on behalf of the users who are currently logged in. For security reasons, the OAuth 2.0 scopes determine which services users are authorized for on the side of the OAuth 2.0 server.
Please also make sure that you implement SAP Note 2043775 .
The OAuth 2.0 client supports the following grant types: