HOOK_URL in punch-out catalogue

Hi all,

I try to make a connection with a punch-out catalog but can't get it to work propperly.

The suplier says the HOOK_URL has to be maintained by a url provided by us, but when I read the documentation the HOOK_URL isn't mandatory and is filled automaticly.

Is it possible that the HOOK_URL has to be filled and how do I get the wright url?

Kind regards,

Jorgen