Hi Gazza,
I've found my Merchant ID
& Merchant Key on the integration page of Google Checkout,
& I've put your API callback url in the box there, what about the other settings on the page?
Do I need to check the box for?
& which callback method should I select?Shopping trolley post security
For extra security, my company will only post digitally signed XML shopping trolleys. (Google should reject all others)
Callback method:
XML
e.g. <google-order-number>123</google-order-number>
HTML (name/value pairs)
e.g. google-order-number=123