Как добавить попап с формой «Сообщить о наличии», если товар закончился — WordPress + WooCommerce

add_filter('woocommerce_get_availability_text', 'themeprefix_change_soldout', 10, 2 );

function themeprefix_change_soldout ( $text, $product) {
    if ( !$product->is_in_stock() ) {
        $text = '<div class="stock-status-wrap"><p class="stock out-of-stock">'. __('Out of stock', 'ns') .'</p><a href="#popup-notify" class="button button-alt fancybox-inline">'. __('Notify me', 'ns') .'</a></div>';
    }

    return $text;
}

<div class="fancybox-hidden">
  <div class="popup popup-form" id="popup-notify">
    <div class="popup-container">
      <h2 class="title"><?php _e('Notify me', 'ns'); ?></h2>
      <?php echo do_shortcode('[contact-form-7 id="1" title="Notify me"]'); ?>
    </div>
  </div>
</div>

<div class="fancybox-hidden">
  <div class="popup popup-success" id="popup-success">
    <div class="popup-container">
      <div class="title"><?php _e('You will receive a message', 'ns'); ?></div>
      <div class="subtitle"><?php _e('as soon as the product is available', 'ns'); ?></div>
    </div>
  </div>
</div>

// show succes pop-up after sending form
document.addEventListener('wpcf7mailsent', function (event) {
    var id = event.detail.contactFormId;

    if (id == 210222) {
        $.fancybox({ href: '#popup-success-subscribe' });
    } else {
        $.fancybox({ href: '#popup-success' });
    }
}, false);

// POPUP
.popup {
  position: relative;
  width: 420px;
  max-width: 100%;

  .popup-container {
    padding: 40px 40px;
  }

  .title {
    font-size: 35px;
    line-height: 1;
    color: #4e637f;
    font-weight: 500;
    text-align: center;
    margin-bottom: 26px;
  }

  .subtitle {
    font-size: 24px;
    line-height: 1.2;
    text-align: center;
    margin-bottom: 0;
    max-width: 100%;
  }

  input {
    display: block;
    font-family: "Ubuntu", sans-serif;
    background: #fff;
    color: #000;
    border: 1px solid #cacaca;
    height: 58px;
    padding: 10px 14px;
    font-size: 20px;
    box-sizing: border-box;
    min-width: 100%;
    max-width: 100%;
    outline: none;
  }

  input[type="submit"] {
    margin-bottom: 0;
    border: none;
    width: 100%;
    background: #409bcc;
    color: #fff;

    &:hover {
      background-color: #1f80b5;
    }
  }

  .wpcf7-form-control-wrap {
    display: block;
  }

  .wpcf7-not-valid-tip {
    position: absolute;
    top: 2px;
    right: 2px;
    z-index: 100;
    background: #fff;
    border: 1px solid #ff0000;
    font-size: 12px;
    padding: 2px 5px;
  }

  .wpcf7-response-output {
    display: none !important;
  }

  .wpcf7-spinner {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    margin: 0;
  }

  @media (max-width: 768px) {
    .popup-container {
      padding: 25px 30px;
    }

    input {
      height: 46px;
      padding: 10px 10px;
    }

    .title {
      font-size: 24px;
      margin-bottom: 15px;
    }

    .subtitle {
      font-size: 18px;
    }
  }
}

.popup-success {
  position: relative;
  width: 560px;
  max-width: 100%;
}