You need to specificate a merchant URL at the Docdata Backoffice. Set the URLs to:
https://your-whmcs-installation/modules/gateways/callback/docdata.php?key=&||i=
You need to specificate a merchant URL at the Docdata Backoffice. Set the URLs to:
https://your-whmcs-installation/modules/gateways/callback/docdata.php?key=&||i=