class BearerTokenAuthenticationExamples {
    public static void main {

        private static final String GRANT_TYPE = "grant_type_to_be_used";
        private static final String CLIENT_SID =
        "client_id_of_the_organization";
        private static final String CLIENT_SECRET = "client_secret_of_organization";
        private static final String ORGANISATION_ID = "id_of_the_organization";

        //Getting access token - Method #1
        TwilioOrgsTokenAuth.init(GRANT_TYPE, CLIENT_ID, CLIENT_SECRET);

        //Getting access token - Method #2
        //To provide custom token manager implementation
        //Need not call init method if customer token manager is passed
        //TwilioOrgsTokenAuth.setTokenManager(new CustomTokenManagerImpl(GRANT_TYPE, CLIENT_ID, CLIENT_SECRET));

        fetchAccountDetails();
    }

    private static void fetchAccountDetails() {
       ResourceSet<Account> accountSet = Account.reader(ORGANISATION_ID).read();
       String accountSid = accountSet.iterator().next().getAccountSid();
       System.out.println(accountSid);
    }
}