3d Innovation submit coupon JS

(function() {
    var COUPON_TEXT = 'TEST_COUPON';
    var pageCouponInput = document.querySelector('#coupon_code');
    var submitCouponButton = document.querySelector('button[title="Apply Coupon"]');
    if (COUPON_TEXT && pageCouponInput && submitCouponButton) {
        pageCouponInput.value = COUPON_TEXT;
        submitCouponButton.click();
    }
})();