Availability of Woocommerce Session after checkout?

Question

I'm currently using a Woocommerce session to save information that the user inputs on the cart page which affects a fee added to the transaction.

I need to be able to access this information right after the order has been completed to make necessary updates to the user's account.

I figured woocommerce_thankyou would be a good hook to use, but unfortunately the session only seems to be available half of the time.

Are there any better hooks to use where I could confirm that the purchase had been completed and the session information would be available?

Answer 1

You need to save that session data as custom order meta data, to be able to use it afterwards (replace my_key, in the code below, with the correct session key):

// Add custom order meta data with temporary data from WC_Session
add_action( 'woocommerce_checkout_create_order', 'add_session_data_as_custom_order_meta_data', 10, 2 );
function add_session_data_as_custom_order_meta_data( $order, $data ) {
    if ( $session_data = WC()->session->get('my_key') ) {
         $order->update_meta_data( '_session_data', $session_data );
    }
}

Code goes on function.php file of your active child theme (or theme). Tested and works.

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Then to access the data you will use th WC_Data method get_meta() on the WC_Order Object:

$session_data = $order->get_meta('_session_data');

Or also using get_post_meta() function from a defined order Id:

$session_data = get_post_meta( $order_id, '_session_data', true );