OAuth 2.0. Client Credentials and Authorization Code grants - Enable client_secret_basic method

Description

Introducing a new way to authenticate with SmartRecruiters APIs using the client_secret_basic OAuth client authentication method.

This change enables the method based on the client ID and client secret, which are sent in the Authorization header of the token exchange request.
This method can be used for the OAuth 2.0. Client Credentials and Authorization Code grants.

Impact

This change provides an additional way to authenticate with SmartRecruiters APIs using the client_secret_basic method.
This change does not affect existing authentication methods.

References