Example: Add order item meta to WC REST API

wc-add-order-item-meta-to-rest-response.php

<?php // only copy if needed

/**
 * Example: Add order meta to the REST API
 * WC 2.6+
 *
 * @param \WP_REST_Response $response The response object.
 * @param \WP_Post $post Post object.
 * @param \WP_REST_Request $request Request object.
 * @return object updated response object
 */
function wc_add_rest_order_meta( $response, $post, $request ) {

	$order_data = $response->get_data();
	
	foreach ( $order_data['line_items'] as $key => $item ) {
		$order_data['line_items'][ $key ]['metakey'] = wc_get_order_item_meta( $item['id'], '_meta_value_key', true );
	}
	
	$response->data = $order_data;

	return $response;	
}
add_filter( 'woocommerce_rest_prepare_shop_order', 'wc_add_rest_order_meta', 10, 3 );

Hi everyone, there's a couple changes you'll need to make to get this working with the latest version of the API:

In my code I used get_post_meta for the item, you can change that to whatever you like.

add_filter( 'woocommerce_rest_prepare_shop_order_object', 'my_wc_prepare_shop_order', 10, 3 );

function my_wc_prepare_shop_order( $response, $object, $request ) {
$order_data = $response->get_data();

foreach ( $order_data['line_items'] as $key => $item ) {
$order_data['line_items'][ $key ]['mykey'] = get_post_meta( $item['product_id'], 'mykeyname', true );
}

$response->data = $order_data;
return $response;
}

this worked for me. thanks

I'm trying to add that code into my function.php file but I can't get the product attribute values ​​from the order detail API to come out, can you please help me.