Add extra meta for orders in Woocommerce

Question

I\'m creating a custom plugin for my website.

In some part of this plugin I need to store extra meta in wp_postmeta for each orders.

I added thi

Answer 1

The 2018 way:

Built on Guido W.P. answer you can use instead woocommerce_checkout_create_order action hook in a more lighter and effective version code (using WC 3+ CRUD methods):

add_action('woocommerce_checkout_create_order', 'before_checkout_create_order', 20, 2);
function before_checkout_create_order( $order, $data ) {
    $order->update_meta_data( '_custom_meta_key', 'value' );
}

Code goes in function.php file of your active child theme (or active theme).

Tested and works in WooCommerce 3+ (only).

---

SOME EXPLANATIONS:

The woocommerce_checkout_create_order action hook is just one step before saving the order data. See below in an extract of the WC_Checkout create_order() method (with both hooks):

/**
 * Action hook to adjust order before save.
 * @since 3.0.0
 */
do_action( 'woocommerce_checkout_create_order', $order, $data );

// Save the order.
$order_id = $order->save();

do_action( 'woocommerce_checkout_update_order_meta', $order_id, $data );

return $order_id;

Why using woocommerce_checkout_create_order instead?:

• Because You don't need to use $order = wc_get_order( $order_id ); as you already got $order as an argument in the hooked function.
• You don't need to use $order->save(); as this will be done just after anyway (see the source code)
• This hook has been released since WooCommerce version 3 and it's made for the same purpose, allowing to use all available WC_Order methods.

So this just works with a single line of code inside the function.