Hi ,
i m using an old learning course that used this URL for teaching the POSTMAN
for calling these apis it need a Bearer {{token}} for its Authorization field.
please tell me where i can find this token ?
Welcome to the Postman Community 
From the documentation, it looks like you use the Log In request. Provide some dummy details and the token is returned in the response.
You can capture that in a variable called token and you will be able to use this on the requests that require a token.