Cannot call rails API with Neo4j DB, response code 403 instead 200

I have configured neo4j DB with existing rails app.Neo4j is running in my http://localhost:7474.In this case how can i get my username and password for postman Basic auth.

And i am trying to hit rails API via postman.In postman Authorization type is Basic auth .

when postman hits rails API, rails throwing some “UnauthenticatedException” error.

Error in postman,

{
    "statusCode": 403,
    "error": "Invalid Session, please login",
    "requestId": "4cc59e17-07c4-4f16-84e0-30c809ff8d0b"
}

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