Adds Payline payment mean in orders screen.

payline-payment-mean-admin-column.php

<?php
// Payline : préciser le mode de paiement dans les commandes
add_action('manage_shop_order_posts_custom_column', 'payline_payment_mean_admin_column', 10, 2);
function payline_payment_mean_admin_column($column)
{
    global $post;
    switch ($column) {
        case 'order_total' :
            $paymentmean = get_post_meta($post->ID, 'Payment mean', true);
            if(!empty($paymentmean)){
                echo '<small class="meta">'.$paymentmean.'</small>';
            }
            break;
    }
}