Good morning everyone and happy new year. I need some advice on how to proceed with the following implementation. For my site in multiple languages that uses Polylang as a plugin, I would need to have separate and consecutive numbering for the orders. For example: Italian: IT-2024-01, IT-2024-02, IT-2024-03 German: DE-2024-01, DE-2024-02, DE-2024-03. Thank you for your interesting insights. Right now I just used this snippet for the italian: /** Orders Prefix */ add_filter( 'woocommerce_order_number', 'change_woocommerce_order_number' ); function change_woocommerce_order_number( $order_id ) { $order = wc_get_order( $order_id ); if ( $order && $order->get_date_created() ) { $order_year = $order->get_date_created()->format( 'Y' ); $prefix = 'IT-' . $order_year . '-'; $new_order_id = $prefix . $order_id; return $new_order_id; } return $order_id; } Thanks, from my heart!