siDetail = "{"billingAmount": "150.00","billingCurrency": "INR","billingCycle": "WEEKLY","billingInterval": 1,"paymentStartDate": "2019-09-18","paymentEndDate": "2020-10-20"}"
beneficiaryDetail = "{"beneficiaryAccountNumber":"1234567890"}"
// Hash calculation for Cards & StoreCards
Hash = sha512(key|txnid|amount|productinfo|firstname|email|udf1|udf2|udf3|udf4|udf5||||||siDetail|SALT)
// Hash calculation for NB
Hash = sha512(key|txnid|amount|productinfo|firstname|email|udf1|udf2|udf3|udf4|udf5||||||siDetail|beneficiaryDetail|SALT)