initC4w

Initialize the SDK

This method is assumed to be called every time the app starts

    /**
     * This method assumed to be called every time the app is started.
     * This method will (if the customer is already registered/logged in the app)
     *  - update the `lastseen` of the customer
     *  - update the push token of the customer (Firebase token)
     *  - update the guId (GeoUniq device id) of the customer
     */
    @TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR2)
    public void initC4w();