Has anyone built a gadget for finesse using a signed request? Can anyone provide an example of XML configuration and gadget config. It looks like you only configure the parameter as shown below. I'm not sure what process is signing the request or how I might specify a cert to be used for signing request.
All the links from Google's openSocial pages indicate Oauth is no longer supported and I don't know what other way I might be secure the client side request.