Hi,

I have used this code below to autocomplete orders:

////Auto Complete all WooCommerce orders.
add_action( 'woocommerce_thankyou', 'custom_woocommerce_auto_complete_order' );
function custom_woocommerce_auto_complete_order( $order_id ) { 
    if ( ! $order_id ) {
        return;
    }

    $order = wc_get_order( $order_id );
    $order->update_status( 'completed' );
}

But since I put this code, invoices are not send automatically.
It still create invoice, but there are not send.
Can you tell me why?

Thank you
Laure