Best way to get authToken in RequestInterceptor

[Satch]

I'm completely confused on how this template flows. Using the AccountManager makes complete sense, but how do i get the auth token to include part of the header for calls requiring it ? I have tried to do the following, but i think it's completely the wrong way to go about it 

 @Override

    public void intercept(RequestFacade request) {

        // Add header to set content type of JSON

        request.addHeader("Content-Type", "application/json");

        // Add auth info to request header

        AccountManager accountManager = apiKeyProvider.getAccountManager();

        Account[] accounts = accountManager.getAccountsByType(Constants.Auth.BOOTSTRAP_ACCOUNT_TYPE);

        if (accounts.length != 0) {

            String token =

                    accountManager.peekAuthToken(accounts[0], Constants.Auth.AUTHTOKEN_TYPE);

            if (token != null) {

                    request.addHeader(Constants.Http.HEADER_AUTH_STRING,token);

            }

        }

        // Add the user agent to the request.

        request.addHeader("User-Agent", userAgentProvider.get());

    }