// Step 1: Add this BEFORE "That's all, stop editing!" in wp-config.php
define( 'WP_ALLOW_MULTISITE', true );

// After running the multisite installer via WP Admin Network Setup,
// wp-config.php gets these additional constants for your WooCommerce multisite setup:
define( 'MULTISITE',           true );
define( 'SUBDOMAIN_INSTALL',   false );   // false = subdirectory, true = subdomain
define( 'DOMAIN_CURRENT_SITE', 'yourdomain.com' );
define( 'PATH_CURRENT_SITE',   '/' );
define( 'SITE_ID_CURRENT_SITE', 1 );
define( 'BLOG_ID_CURRENT_SITE', 1 );

// Recommended for WooCommerce multisite setup: upload handling
define( 'UPLOADBLOGSDIR', 'wp-content/blogs.dir' );

// .htaccess also needs updating — WP Admin Network Setup provides the exact rules

# Network-activate WooCommerce across all sites in the multisite setup
wp plugin activate woocommerce --network

# Verify WooCommerce is active on all sites
wp site list --field=url | xargs -I{} wp --url={} plugin status woocommerce

# Run WooCommerce setup on each subsite for the multisite setup
wp site list --field=url | xargs -I{} wp --url={} wc tool run install_pages

<?php
// Get WooCommerce currency for a specific site in the multisite setup
function caz_get_site_currency( int $blog_id ): string {
    switch_to_blog( $blog_id );
    $currency = get_option( 'woocommerce_currency', 'GBP' );
    restore_current_blog();
    return $currency;
}

// Set WooCommerce currency for a specific subsite in the multisite setup
function caz_set_site_currency( int $blog_id, string $currency ): void {
    switch_to_blog( $blog_id );
    update_option( 'woocommerce_currency', $currency );
    restore_current_blog();
}

// Example: configure UK and EU sites in the WooCommerce multisite setup
caz_set_site_currency( 2, 'GBP' );  // UK site
caz_set_site_currency( 3, 'EUR' );  // EU site
caz_set_site_currency( 4, 'USD' );  // US site

function caz_get_network_products( int $main_blog_id = 1, array $args = [] ): array {
    // Switch to main blog to query shared products for the multisite setup
    switch_to_blog( $main_blog_id );

    $products = wc_get_products( array_merge([
        'status'  => 'publish',
        'limit'   => 20,
        'return'  => 'objects',
    ], $args ));

    restore_current_blog();

    return $products;
}

// Display products from the shared catalogue on any subsite
add_shortcode( 'caz_network_products', function( $atts ) {
    $products = caz_get_network_products( 1, [ 'limit' => 12 ] );
    ob_start();
    foreach ( $products as $product ) {
        // Render product card using main site's product data
        echo '<div class="caz-net-product">';
        echo '<a href="' . esc_url( get_site_url( 1 ) . '/product/' . $product->get_slug() ) . '">';
        echo esc_html( $product->get_name() );
        echo '</a></div>';
    }
    return ob_get_clean();
});