tm-woo-product-api-link-disable-duplicate.php

<?php
/**
 * Plugin Name: TM WooCommerce Product API Link Disable Duplicate
 * Plugin URI:
 * Description: Disable product syncing when WooCommerce duplicate. When duplicating a product with WooCommerce basic function, it copies synced ID. Then original and duplicated product has same destination ID. This plugin removes the product ID then disable syncing for new duplcated product.
 * Version: 1.0.0
 * Author: yousan
 */

// @see ../woocommerce/includes/admin/class-wc-admin-duplicate-product.php

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}
if ( class_exists( 'TWPALDD', false ) ) {
	TWPALDD::register_hook();
}

class TWPALDD {
	public static function register_hook() {
		add_action( 'woocommerce_product_duplicate_before_save', array( self::class, 'disable' ), 10, 2 );
	}

	/**
	 * Delete synced product_id meta key from duplicated product.
	 * The $duplicate variable is passed as reference, so this hook do action without returns.
	 *
	 * @param WC_Product $duplicate
	 * @param WC_Product $product
	 */
	public static function disable( $duplicate, $product ) {
		/** @var WC_Meta_Data $meta */
		foreach ( $duplicate->get_meta_data() as $array_key => $meta ){
			if ( FALSE !== strpos($meta->key, 'tm_woo_api_dest_product_id_' ) ) {
				$duplicate->delete_meta_data($meta->key);
			}
		}
	}
}