WooCommerce: How to insert a value from $_GET into $order->update_meta_data

I’m trying to insert a value as custom meta for a WooCommerce order from a query string parameter the url e.g.: mystore.com/checkout?myparam=customvalue

For some reason I cannot return any value from $_GET :

add_action('woocommerce_checkout_create_order', 'before_checkout_create_order', 20, 2);

function before_checkout_create_order( $order, $data ) {

     if ( isset( $_GET['myparam'] ) ) {
          $myvalue = $_GET['myparam'];
     }

     $order->update_meta_data( '_mymeta', $myvalue );

}

I’m confused because I believe woocommerce_checkout_create_order fires upon hitting submit for the checkout so I don’t understand why it wouldn’t be able to pull this from the current url.

I’ve tested dummy values such as $myvalue = 'test'; to ensure the meta data is inserted and that works fine.

• This topic was modified 3 years, 2 months ago by zumajoe.