There is a name mismatching between the property $ruleFactory and its usage:
{"message":"Erreur de requete pour la nouvelle transaction : Notice: Undefined property: HiPay\FullserviceMagento\Helper\Data::$_ruleFactory in [...]/vendor\/hipay\/hipay-fullservice-sdk-magento2\/Helper\/Data.php on line 84."}
Hi,
There is a name mismatching between the property $ruleFactory and its usage:
Regards