Cách thêm nút Mua Ngay vào woocommerce (ok)

https://giuseart.com/nut-mua-mgay-vao-woocommerce-mot-cach-don-gian/

add_action('woocommerce_after_add_to_cart_button','devvn_quickbuy_after_addtocart_button');
function devvn_quickbuy_after_addtocart_button(){
    global $product;
    ?>
    <button type="submit" name="add-to-cart" value="<?php echo esc_attr($product->get_id()); ?>" class="single_add_to_cart_button button alt" id="buy_now_button">
        <?php _e('Mua ngay', 'devvn'); ?>
    </button>
    <input type="hidden" name="is_buy_now" id="is_buy_now" value="0" />
    <script>
      jQuery(document).ready(function(){
        jQuery('body').on('click', '#buy_now_button', function(){
          if(jQuery(this).hasClass('disabled')) return;
          var thisParent = jQuery(this).closest('form.cart');
          jQuery('#is_buy_now', thisParent).val('1');
          thisParent.submit();
        });
      });
    </script>
  <?php
}
add_filter('woocommerce_add_to_cart_redirect', 'redirect_to_checkout');
function redirect_to_checkout($redirect_url) {
  if (isset($_REQUEST['is_buy_now']) && $_REQUEST['is_buy_now']) {
    $redirect_url = wc_get_checkout_url();
  }
  return $redirect_url;
}

Nó gắn vào hook này

<?php do_action( 'woocommerce_after_add_to_cart_button' ); ?>