Updating ACF field with purchased product's term ids - WooCommerce - wordpress

Question

I am trying to update the a 'product_themes' user field in WooCommerce/WP with a function that collects the term_ids for the items in an order and adds them to the user's profile under the 'product_themes' field at the time when the order is placed. This is working when I specify an array of IDs in the code but does not seem to be collecting the term IDs from each item for a custom 'theme' taonomy.
add_action('woocommerce_thankyou', 'add_theme_to_user');
add_action('woocommerce_new_order', 'add_theme_to_user');
function add_theme_to_user($order_id){
$current_user = wp_get_current_user();
$userID = $current_user->ID;
$user = 'user_' . $userID;
$prodCats = array();
$order = new WC_Order( $order_id );
$items = $order->get_items();
$push = array();
foreach ( $items as $item ) {
$item_id = $item['order_item_id'];
$product_name = $item['name'];
$terms = wp_get_post_terms( $itemID, 'theme' );
foreach ( $terms as $term){
array_push($push, $term->term_id);
}
}
update_field('product_themes', $push, 'user_' . $userID);
}
I have consulted the WooCommerce documentation and searched for a solution on any similar problems but I cannot seem to get this to work. Am I missing something?
Many thanks.

Answer 1

I found the solution myself, changed $itemID = $item['order_item_id']; to $itemID = $item['product_id'];
add_action('woocommerce_thankyou', 'add_theme_to_user');
add_action('woocommerce_new_order', 'add_theme_to_user');
function add_theme_to_user($order_id){
$current_user = wp_get_current_user();
$userID = $current_user->ID;
$user = 'user_' . $userID;
$prodCats = array();
$order = new WC_Order( $order_id );
$items = $order->get_items();
$push = array();
foreach ( $items as $item ) {
$itemID = $item['product_id'];
$terms = wp_get_post_terms( $itemID, 'theme' );
foreach ( $terms as $term){
array_push($push, $term->term_id);
update_field('product_themes', $push, 'user_' . $userID);
}
}
update_field('product_themes', $push, 'user_' . $userID);
}