Is there a Substitution keyword for SitePlacement url?

Question

Hi,

I'm wondering if there are any substitution keywords related to SitePlacement for v6? We would like to track where a click on a site placement originated. More specifically, is there a dynamic tag - {xxx} - that will give us the Url property from the SitePlacement object?

If this doesn't exist, will {OrderItemID} map to the SitePlacement's Id property?

Thanks in advance for any help.
Hans

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HK