API Call Back with parameter

Please help with the following:

I would like to use the HTML API and post a dynamic
parameter, and
then have that parameter returned to me upond google
checkout
completing the transaction via the API URL callback:

When posting a purchase, is there a way for me to include a
value pair
(e.g. hidden input parameter) of a unique ID I have created
for this
purchase.  The parameter would get passed to google checkout
as the
user presses the 'google checkout' button, and I would hope
the
parameter could get passed back to me upon google checkout
completion,
and the API callback taking place.  Specifically, how would
I pass the
parameter: could I simply add <INPUT
TYPE="hidden" name="myID"
value="myIDValue">
and would there be anyway the API URL callback could pass
the
parameter back to me:
http://www.mysite.com/gcheckout/processID.jsp?myID=m
yIDValue




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