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Paytm checksum mismatch. for production Api keys

I'm trying to integrate Paytm payment gateway in android native app. With test Api keys it's working fine. but with production Api keys it gives error:

"Payment Transaction response Bundle[{STATUS=TXN_FAILURE, ORDERID=r_5_3, TXNAMOUNT=1.00, MID=******, RESPCODE=330, BANKTXNID=, CURRENCY=INR, RESPMSG=Paytm checksum mismatch.}]"

I'm following https://developer.paytm.com/docs/v1/android-sdk for android integration. (According to environment I'm changing all the required parameters e.g MID, WEBSITE, INDUSTRY_TYPE_ID, CALLBACK_URL)

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