Print Membership Number

Hi!

I insert a function on functions.php to generate a customer number.
Is there a way to include the customer number on pdf after the billing-details?

This is my function.php:

//create unique id (Membership Number) on new user creation
add_action( ‘user_register’, ‘my_on_user_register’ );
function my_on_user_register( $user_id ) {
$unique_id = 4000 + $user_id;
update_user_meta( $user_id, ‘my_unique_id’, $unique_id );
}
//display Membership Number on profile
add_action(‘show_user_profile’, ‘my_extra_user_profile_fields’);
add_action(‘edit_user_profile’, ‘my_extra_user_profile_fields’);
function my_extra_user_profile_fields($user){

$unique_number = get_the_author_meta(‘my_unique_id’, $user->ID);
?>
<h3><?php _e(‘Kundennummer’); ?></h3>

<table class=”form-table”>
<tr>
<th><label for=”address”><?php _e(‘Kundennummer:’); ?></label></th>
<td><?php echo $unique_number; ?></td>
</tr>
</table>
<?php
}

//add Membership Number to user list
function new_modify_user_table( $column ) {
$column[‘my_unique_id’] = ‘Kundennummer’;
return $column;
}
add_filter( ‘manage_users_columns’, ‘new_modify_user_table’ );

function new_modify_user_table_row( $val, $column_name, $user_id ) {
$user = get_userdata( $user_id );
switch ($column_name) {
case ‘my_unique_id’ :
return get_the_author_meta( ‘my_unique_id’, $user_id );
break;
default:
}
return $return;
}
add_filter( ‘manage_users_custom_column’, ‘new_modify_user_table_row’, 10, 3 );

Thanks for your help!

https://wordpress.org/plugins/woocommerce-delivery-notes/