Invoke web service with certificate

Hi,

Webmethods 7.1

i need a help with send a soap message with certificate.
I’m using public.client:soapclient and service should be invoke with security.
I’m confused how to pair add certificate to service, descriptor.

Thanks in advance for help

what is the difference between 6.5 and 712?

I don’t know wheather is any diference. I’m only ask for help to associate certificate with invoking service.
When i try to do this due to the documentation i got Alert Fatal: bad certificate.

Waiting for help.