Don't know 1) and 3) - will be interested to hear.
2) The notification API.
4) Setting up a "webservice" is no big deal. Just
create a simple
ASPX page with no user interface, this is your callback
page. Create
an XMLdocument object. Load the XML posted by Google into
it, e.g.
myXML.load(request.inputstream). Then read the information
you need
from the various elements provided - it is just an XML
document at
this point so you can do whatever (but remember the
namespace). To
get it all working, setup the URL of your callback page in
the
Merchant Center, and then run some test transactions. It is
a good
idea to save the XML you receive to disk, then you can
inspect it more
easily. It is also useful to configure your callback ASPX
so that it
can take data either from Google, or by loading from an
alternative
disk file that you provide - that way you can test it
without having
to place orders all the time.
Richard
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