MultilingualPress - Automatically copy WooCommerce product SKU & Price to all connected products

functions.php

<?php
add_action('multilingualpress.metabox_after_relate_posts', function($context, $request) {
    
    // get post meta value from source site
    $sku = (string)$request->bodyValue(
        '_sku',
        INPUT_POST,
        FILTER_SANITIZE_STRING
    );
    
    $regularPrice = (string)$request->bodyValue(
        '_regular_price',
        INPUT_POST,
        FILTER_SANITIZE_STRING
    );
    
    if (empty($sku) && empty($regularPrice)) {
        return;
    }
    // switch to remote sites and save post meta
    $remoteSiteId = $context->remoteSiteId();
    $remotePostId = $context->remotePostId();
    switch_to_blog($remoteSiteId);
    if (!empty($sku)) {
        update_post_meta($remotePostId, '_sku', $sku);
    }
    if (!empty($regularPrice)) {
        update_post_meta($remotePostId, '_regular_price', $regularPrice);
    }
    restore_current_blog();
}, 10, 2);