public MaterialsRedemptionList getMaterialRedemptionList(String asRegistrantId,
                                                             String asParam) {
        return get(
                MaterialsRedemptionList.class,
                REST_URL_MATERIALS
                        + (UtilityMethods.isValidString(asRegistrantId) ? "/"
                        + asRegistrantId : "")
                        + (UtilityMethods.isValidString(asParam) ? "/" + asParam : ""));
    }