I have paid for api access, but i am not able to use WebSocket , as repones showing forbidden

PARTG

I have paid for api access, but i am not able to use WebSocket , as repones showing forbidden
Request Method: GET
Status Code: 403 Forbidden
Request Headers
Sec-WebSocket-Version: 13
Sec-WebSocket-Key: KNKWRpY3sm8nvmItPGXihQ==
Connection: Upgrade
Upgrade: websocket

Nivas

You may go through the Websocket FAQs here.

PARTG

I went through this, Also using same code, key also correct, trying in postman same error.
but no clue