Hello,
My bad, I forgot that the "debug" mode will only record API errors.
In the file "plugins/hikashopshipping/mondialrelay/mondialrelay_class.php" please replace temporally
if(empty($result) || !empty($result->STAT) || empty($result->PointsRelais)) {
if(!empty($options['debug']))
hikashop_writeToLog($result, 'MondialRelay');
By
if(!empty($options['debug']))
hikashop_writeToLog($result, 'MondialRelay');
if(empty($result) || !empty($result->STAT) || empty($result->PointsRelais)) {
And then perform some tests in your website (with some modification in the cart or with a new session so you won't have the HikaShop shipping cache).
While you made your tests, the log will have more debug data ; and you could restore the file as it was or you might have a very big log file in few days.
Regards,