Google Checkout Question Now

Google Checkout Question Now
Hi
I need someone experienced. i have integrated google checkout, everything working fine , apart from response handler. it always give error “the error we got is Send failed with code: 401. Response body was: Invalid Merchant Id/Key Pair”
So i need your 30mins to 1 hour time, so you explain me whole response handler and everything should work at the end.
I prefer if someone help me right now.

Thanks

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