Added two new methods
1) string CheckSumgenerateBodySignature(string key, string body)
2) boolean CheckSumverifyBodySignature(string key, string body, string checksum)
Paytm has updated a new checksum dll, so updated the extension.
Added methods
1) Paytm_CheckSumgenerateSignature
2) Paytm_CheckSumverifySignature
Removed methods (as they are no longer supported by Paytm)
1) Paytm_CheckSumgenerateCheckSum
2) Paytm_CheckSumgenerateCheckSumByJson
3) Paytm_CheckSumgenerateCheckSumForRefund
4) Paytm_CheckSumverifyCheckSum
5) Paytm_CheckSumverifyCheckSumByjson