override fun authenticate(route: Route?, response: Response): Request? {

        val refreshToken = helper.getRefreshToken()

        Timber.d(refreshToken + " " + helper.getClientToken())

        synchronized(this) {
            addDisposable(
                tokenService.refreshTokenClient(
                    BuildConfig.TOKEN_URL, TOKEN_ID_INSTAWAGE,
                    TOKEN_SECRET, TOKEN_GRANT_REFRESH, refreshToken!!
                )
                    .subscribeOn(schedulers.io())
                    .observeOn(schedulers.main())
                    .subscribe(
                        { response ->
                            helper.setClientToken(response.body()!!.access_token)
                            helper.setClientToken(response.body()!!.refresh_token)
                        },
                        { Timber.e(it) })
            )

            Timber.d(
                "new access + refresh ".plus(helper.getRefreshToken())
                    .plus(" " + helper.getClientToken())
            )

            return response
                .request
                .newBuilder()
                .header("Authorization", "Bearer ".plus(helper.getClientToken())).build()
        }
    }