How can I get a userid, password and clientid to use websocket api to send levels (closing price) to refinitiv? These login credentials will be used by BlackRock Index Services.
Do you mean you want to contribute data to Refinitiv using the WebSocket API? If so, the WebSocket (and RTSDK) consumer application can contribute data to Refinitiv via the Refinitiv Contribution Channel (RCC) .
Please contact your Refinitiv representative to help you with the RCC credentials.
Once you have the RCC credentials, you can find how to contribute data to RCC via the following resources: