EMA C++ Developers Guide : 6 Consuming Data from the Cloud : 6.5 Version 2 Authentication Using oAuth Client Credentials
 
6.5 Version 2 Authentication Using oAuth Client Credentials
Version 2 OAuth Client Credentials requires a client ID and client secret, or private JWK for JWT, or a client ID and private client JWK for OAuth Client Credentials with JWT. Version 2 will generate an Access Token.
Once connected to Real-Time — Optimized RTC, the login session to the LSEG Real-Time Connector (RTC) will remain valid until the consumer disconnects or is disconnected from Real-Time — Optimized. The API will only re-request an Access Token in the following cases:
When the consumer disconnects and goes into a reconnection state.
If the Channel stays in reconnection long enough to get close to the expiry time of the Access Token.
Due to the above changes, credentials are managed independently per reactor channel. Channels do not share credentials.