WooCommerce: Add Product To Order After Purchase

On Business Bloomer I sell a bundle of products, and I use no Bundles plugin for that. So the challenge was to programmatically add a list of products to the order upon purchase, once the bundle product is purchased.

This is an amazing way to save time for the customer, as they don’t need to manually add each product to the cart. In the background, after a successful purchase, some magic code (that you find below) adds products to the order, sets their price to $0.00 (so that the order total is not altered), and saves the order. Enjoy!

This screenshot may be too small, but basically the first product is the only one purchased, while the following ones are added later on by the code below!

PHP Snippet: Programmatically Add Product To a Paid WooCommerce Order

Please note – the code below searches through the order items to see if product ID = “123” is present. This is the “bundle” product.

When that is purchased, my code triggers and adds to cart product ID = “456”. You can of course add multiple products by adding as many $order->add_product lines as you wish.

/**
 * @snippet       Add Product @ WooCommerce Order
 * @how-to        Get CustomizeWoo.com FREE
 * @author        Rodolfo Melogli
 * @compatible    WooCommerce 7
 * @donate $9     https://businessbloomer.com/bloomer-armada/
 */

add_action( 'woocommerce_payment_complete', 'bbloomer_add_products_to_order', 9999 );

function bbloomer_add_products_to_order( $order_id ) {
	$order = wc_get_order( $order_id );
	foreach ( $order->get_items() as $item_id => $item ) {
		$product_id = $item->get_product_id();
		if ( $product_id && $product_id == 123 ) {
			$order->add_product( wc_get_product( 456 ), 1, array( 'subtotal' => 0, 'total' => 0 ) );	
			$order->save();			
			//wc_downloadable_product_permissions( $order_id, true ); ADD THIS IF ADDED PRODUCT IS DOWNLOADABLE
         //wc_update_product_stock( wc_get_product( 456 ), 1, 'decrease' ); ADD THIS IF YOU WANT TO REDUCE PRODUCT STOCK BY 1
			break;
		}
	}
}
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Where to add custom code?

You should place PHP snippets at the bottom of your child theme functions.php file and CSS at the bottom of its style.css file. Make sure you know what you are doing when editing such files - if you need more guidance, please take a look at my guide "Should I Add Custom Code Via WP Editor, FTP or Code Snippets?" and my video tutorial "Where to Place WooCommerce Customization?"

Does this snippet (still) work?

Please let me know in the comments if everything went as expected. I would be happy to revise the snippet if you report otherwise (please provide screenshots). I have tested this code with Storefront theme, the WooCommerce version listed above and a WordPress-friendly hosting.

If you think this code saved you time & money, feel free to join 17,000+ WooCommerce Weekly subscribers for blog post updates and 250+ Business Bloomer supporters for 365 days of WooCommerce benefits. Thank you in advance!

Need Help with WooCommerce?

Check out these free video tutorials. You can learn how to customize WooCommerce without unnecessary plugins, how to properly configure the WooCommerce plugin settings and even how to master WooCommerce troubleshooting in case of a bug!

Rodolfo Melogli

Business Bloomer Founder

Author, WooCommerce expert and WordCamp speaker, Rodolfo has worked as an independent WooCommerce freelancer since 2011. His goal is to help entrepreneurs and developers overcome their WooCommerce nightmares. Rodolfo loves travelling, chasing tennis & soccer balls and, of course, wood fired oven pizza.

Questions? Feedback? Support? Leave your Comment Now!
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If you are writing code, please wrap it between shortcodes: [php]code_here[/php]. Failure to complying with this (as well as going off topic, not writing in English, etc.) will result in comment deletion. You should expect a reply in about 2 weeks - this is a popular blog but I need to get paid work done first. Please consider joining BloomerArmada to get blog comment reply priority, ask me 1-to-1 WooCommerce questions and enjoy many more perks. Thank you :)

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