Add custom field as an order note in Woocommerce - php

Question

I'm trying to add a custom field jckwds_date as an order note. I can't for the life of me figure out why this code isn't working in functions.php?
The code also only allows the note to be added in the are a certain role type.
function wdm_my_custom_notes_on_single_order_page($order){
$user = wp_get_current_user();
$allowed_roles = array('eu_no_vat', 'super_wholesale_customer', 'wholesale_customer');
if( array_intersect($allowed_roles, $user->roles ) ) {
$value = get_post_meta( $product->get_id(), 'jckwds_date', true );
echo $value;
$order->add_order_note( $value, $is_customer_note = 1 );
}
}
Basically I need THIS:
To be added HERE:

Answer 1

Update:
The following code will add from the order custom field 'jckwds_date' (or checkout posted field value 'jckwds_date') an order note that will appear in backend for defined user roles:
add_action( 'woocommerce_checkout_update_order_meta', 'product_custom_field_to_custom_order_notes', 100, 2 );
function product_custom_field_to_custom_order_notes( $order_id, $data ){
// HERE define allowed user roles
$allowed_roles = array('administrator', 'super_wholesale_customer', 'wholesale_customer');
$user_id = get_post_meta( '_customer_user', 'jckwds_date', true );
$user = new WP_User( $user_id );
// Exit if no matched user roles
if( ! array_intersect( $allowed_roles, $user->roles ) ) return;
// Get the date custom field (or checkout field)
if( get_post_meta( $order_id, 'jckwds_date', true ) ){
$note = get_post_meta( $order_id, 'jckwds_date', true );
} elseif( isset( $_POST['jckwds_date'] ) ){
$note = sanitize_text_field( $_POST['jckwds_date'] );
}
// The order note
if( isset($note) && ! empty($note) ){
$order = wc_get_order( $order_id ); // The WC_Order Object
$order->add_order_note( $note ); // Add the note
$order->save(); // Save the order
}
}
Code goes in function.php file of the active child theme (or active theme). It should work.

Answer 2

add_filter( 'woocommerce_checkout_fields' , 'custom_add_checkout_fields' );
// Our hooked in function - $fields is passed via the filter!
function custom_add_checkout_fields( $fields ) {
unset($fields['order']['order_comments']);
$fields['order']['order_note']['priority'] = 5;
$fields['order']['order_note'] = array(
'label' => __('Order Notes', 'woocommerce'),
'placeholder' => _x('Order Notes', 'placeholder', 'woocommerce'),
'required' => true,
'class' => array('form-row-wide'),
'clear' => true
);
return $fields;
}

Answer 3

Try this
$order = wc_get_order( $order_id );
$note = __("This my custom note...");
$order->add_order_note( $note );
$order->save();

Answer 4

Try this
add_action('woocommerce_checkout_update_order_meta', 'checkout_field_update_order_meta');
function checkout_field_update_order_meta($order_id)
{
if (!empty($_POST['field_name'])) {
update_post_meta($order_id, 'MY Custom Field', sanitize_text_field($_POST['field_name']));
}
}

Answer 5

Try this code.
add_action( 'woocommerce_thankyou', 'my_note_custom' );
function my_note_custom( $order_id ) {
$order = new WC_Order( $order_id );
$note = __("This my custom note...");
$order->add_order_note( $note );
$order->save();
}

Answer 6

Found out it was a simple as changing the $product to $order as it is the order custom field value I'm trying to retrieve.
Full code below:
function wdm_my_custom_notes_on_single_order_page($order){
$user = wp_get_current_user();
$allowed_roles = array('eu_no_vat', 'super_wholesale_customer', 'wholesale_customer');
if( array_intersect($allowed_roles, $user->roles ) ) {
$value = get_post_meta( $order->get_id(), 'jckwds_date', true );
$note = '<b>Wholesale</b>';
echo $value;
$order->add_order_note( $value, $is_customer_note = 1 );
}
}