Verify In-App Purchase from Google Play on Backend Node.js

I am working on an mobile app which have some kind of in-app-purchases..

Now on backend/Server-side i want to validate the purchase information from google . There are few module in node for validation but they just validate that data is correct but not contact google for the same. can anyone give any suggations for the same.. In-app-purchase data is like i.e.

{
   "orderId":"12999763169054705758.1364365967744519",
   "packageName":"my package name",
   "productId":"77",
   "purchaseTime":1366217534000,
   "purchaseState":0,
   "purchaseToken":"utfwimslnrrwvglktizikdcd.AOJ1OwZ4l5oXz_3d2SAWAAUgFE3QErKoyIX8WuSEnBW26ntsyDmlLgoUd5lshqIY2p2LnlV4tpH4NITB4mJMX98sCtZizH7wGf6Izw3tfW_GflJDKFyb-g"
}