def METHOD_NAME(headers, token):
    # type: (Dict[str, str], str) -> None
    """Updates the Authorization header with the bearer token.
    This is the main method that differentiates this policy from core's BearerTokenCredentialPolicy and works
    to properly sign the authorization header for Cosmos' REST API. For more information:
    https://docs.microsoft.com/rest/api/cosmos-db/access-control-on-cosmosdb-resources#authorization-header
    :param dict headers: The HTTP Request headers
    :param str token: The OAuth token.
    """
    headers[http_constants.HttpHeaders.Authorization] = "type=aad&ver=1.0&sig={}".format(token)