* Fix - Notice: id was called incorrectly error.

* Added -  external_add_product_link_html filter.
* Added -  external_add_product_link_html_classes filter.

README.md

@@ -21,8 +21,13 @@ All support requests for this extension should be posted to the [WooCommerce Ext
 
 ## Changelog
 
+**1.0.3 - 19/02/20**
+* Fix - Notice: id was called incorrectly error.
+* Added -  external_add_product_link_html filter.
+* Added -  external_add_product_link_html_classes filter.
+
 **1.0.2 - 27/10/17**
-* Added WooCommerce plugin version check compatibility.
+* Added - WooCommerce plugin version check compatibility.
 
 **1.0.1 - 14/02/17**
 * Fix - Added additional css class of product_type_external to archive external products button.

readme.txt

@@ -1,9 +1,9 @@
 === WooCommerce External Product New Tab ===
 Contributors: stuartduff
 Tags: ecommerce, e-commerce, store, sales, sell, shop, cart, checkout, woocommerce
-Requires at least: 4.6
-Tested up to: 4.8
-Stable tag: 1.0.2
+Requires at least: 5.3
+Tested up to: 5,3
+Stable tag: 1.0.3
 License: GPLv3
 License URI: https://www.gnu.org/licenses/gpl-3.0.html
 
@@ -26,8 +26,13 @@ For this extension to function the [WooCommerce](https://wordpress.org/plugins/w
 
 == Changelog ==
 
+= 1.0.3 - 19/02/20 =
+* Fix - Notice: id was called incorrectly error.
+* Added -  external_add_product_link_html filter.
+* Added -  external_add_product_link_html_classes filter.
+
 = 1.0.2 - 27/10/17 =
-* Added WooCommerce plugin version check compatibility.
+* Added - WooCommerce plugin version check compatibility.
 
 = 1.0.1 - 14/02/17 =
 * Fix - Added additional css class of product_type_external to archive external products button.

wc-external-product-new-tab.php

@@ -6,12 +6,12 @@
  * Version:           1.0.2
  * Author:            Stuart Duff
  * Author URI:        http://stuartduff.com
- * Requires at least: 4.6
- * Tested up to:      4.8
+ * Requires at least: 5.3
+ * Tested up to:      5.3
  * Text Domain: wc-external-product-new-tab
  * Domain Path: /languages/
- * WC requires at least: 3.0.0
- * WC tested up to: 3.2.0
+ * WC requires at least: 3.9
+ * WC tested up to: 4.0
  *
  * @package WC_External_Product_New_Tab
  */
@@ -177,12 +177,12 @@ public function external_add_product_link( $link ) {
       /**
        *  The original code is located in the WooCommerce file /templates/loop/add-to-cart.php
        */
-      $link =	sprintf( '<a rel="nofollow" href="%s" data-quantity="%s" data-product_id="%s" data-product_sku="%s" class="%s" target="_blank">%s</a>',
+      $link =	sprintf( apply_filters( 'external_add_product_link_html', '<a rel="nofollow" href="%s" data-quantity="%s" data-product_id="%s" data-product_sku="%s" class="%s" target="_blank">%s</a>' ),
         esc_url( $product->add_to_cart_url() ),
         esc_attr( isset( $quantity ) ? $quantity : 1 ),
-        esc_attr( $product->id ),
+        esc_attr( $product->get_id() ),
         esc_attr( $product->get_sku() ),
-        esc_attr( isset( $class ) ? $class : 'button product_type_external' ),
+        esc_attr( isset( $class ) ? $class : apply_filters( 'external_add_product_link_html_classes', 'button product_type_external' ) ),
         esc_html( $product->add_to_cart_text() )
       );
     }