protected function get_items_to_apply_coupon( $coupon ) {
		$items_to_apply = array();

		foreach ( $this->get_items_to_validate() as $item ) {
			$item_to_apply = clone $item; // Clone the item so changes to this item do not affect the originals.

			if ( 0 === $this->get_discounted_price_in_cents( $item_to_apply ) || 0 >= $item_to_apply->quantity ) {
				continue;
			}

			if ( ! $coupon->is_valid_for_product( $item_to_apply->product, $item_to_apply->object ) && ! $coupon->is_valid_for_cart() ) {
				continue;
			}

			$items_to_apply[] = $item_to_apply;
		}
		return $items_to_apply;
	}