An extension that wraps Paytm checksum utility.
Check out https://developer.paytm.com/docs/checksum for more details
The Paytm checksum utility provides the following methods
1) Paytm_CheckSumgenerateSignature
This method generates a checksum that is needed to post a form to Paytm's server for checkout.
2) Paytm_CheckSumverifySignature
This method verifies a input checksum against a given set of parameters used to generate it.
3) Paytm_CheckSumEncrypt
This method encrypts a string input.
4) Paytm_CheckSumDecrypt
This method decrypts a string input.
Added two new methods
1) string CheckSumgenerateBodySignature(string key, string body)
2) boolean CheckSumverifyBodySignature(string key, string body, string checksum)