Your sales will still show up in ZC admin even if your response-handler file is not working correctly.
Run the shipping generator utility that came with GC. That will build a list of whatever shipping modules you have enabled in your store. Then you copy and paste that list (code) into your /googlecheckout/shipping_methods.php file. (Your paste can overwrite the other default methods.) Now that file will tell GC what shipping methods to offer.
You must also set GC to use your store rates/methods instead of Carrier Calculated rates. ADMIN > MODULES > PAYMENT > GOOGLE CHECKOUT > (GoogleCheckout Carrier Calculated Shipping=False)
Those DEFAULT rates are rock bottom shipping fees to use just in case the store lookup function would fail.
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