Code-Snippets-Functions/Execute a function on a child site/WooCommerce/keep-specific-shipping-methods-for-deposits.txt

add_filter( 'woocommerce_package_rates', 'only_local_pickup_for_deposits', 100, 2 );
function only_local_pickup_for_deposits( $rates, $package ) {
    $has_deposit = false;

    // Loop through cart items for the current shipping package
    foreach( $package['contents'] as $item ) {
        if ( isset($item['is_deposit']) && $item['is_deposit'] ) {
            $has_deposit = true;
            break; // Stop the loop
        }
    }

    // If deposit is enabled for a cart item
    if( $has_deposit ) {
        // Loop through shipping rates
        foreach ( $rates as $rate_key => $rate ) {
            // Remove all shipping methods except "Local pickup" 
            if ( 'local_pickup' !== $rate->method_id ) {
                unset($rates[$rate_key]);
            }
        }
    }
    return $rates;
}