Adding the shop code to the URL
If you have enabled the Add store code to URLs option in the default configuration, the module will modify the return to shop URL and add the shop code and the shop view code.
Warning:
If you enable this option after having installed the payment module, you will have to reinitialize the module configuration so that it gives you the new notification URL to be configured in the Merchant Back Office.
E.g.: http://www.your-domain.com/index.php/payzen/payment/check/
Would become:
http://www.your-domain.com/index.php/fr/payzen/payment/check/