In WooCommerce, when a customer goes to checkout from cart and submit the order, if the payment is not processed, the order is set to \"pending\" payment. The Admin doesn\'t
I've tried with LoicTheAztec answer, @LoicTheAztec thanks a lot for your great code.
I have just changed the action hook from woocommerce_new_order to woocommerce_checkout_order_processed to get it to work.
Here is the action : add_action( 'woocommerce_checkout_order_processed', 'pending_new_order_notification', 20, 1 );
Hope that helps.