Appendix 2

Signature Generation

---

• Signature generation will be using “SHA256WithRSA” algorithm.
• Partner to generate the digital signature of the message, for example the message in below:

{
    "message":{    
        "TxnType":"510",
        "SndrID":"FNXSMYNX",
        "SndrIDType":"2",
        "RcvrBIC":"RPPEMYKL",
        "SndrRefNO":"FNXS00000001,
        "SndrLocalTxntime":"20220505104518",
        "SndDevicetype":"01",
        "SndrDeviceVer":"1.0.35",
        "CatPurp":"CASH",
        "CurrCode":"MYR",
        "Txnamt":1000.00,
        "CdtrAgtBIC":"PBBEMYKL",
        "CdtrAcct ":"73534278991",
        "CdtrAcctType":"SVGS",
        "RcptRef": "20201102REF0001",
        "PymtDesc" :"Transfer via account"
        "IPAddr":"192.0.0.1"
    },  
    "signature":""
}

• Sample code in (Java):

String data = <retrieve the “message” value from the JSON data>
Signature signature = Signature.getInstance("SHA256withRSA"); 
signature.initSign(privateKey); 
byte[] dataInBytes = data.getBytes(); 
signature.update(dataInBytes); 
byte[] signedInfo = signature.sign();

// Covert the signature into Base64 format
String base64SignedInfo = new 
    String(Base64.getEncoder().encode(signedInfo));

• Generate the JSON message with signature generated and send to FINEXUS Retail Payment Gateway.

{
    "message": { 
        "TxnType":"510",
        "SndrID":"FNXSMYNX",
        "SndrIDType":"2",
        "RcvrBIC":"RPPEMYKL",
        "SndrRefNo":"FNXS00000001",
        "SndrLocalTxnTime":"20220505104518",
        "SndrDeviceType":"01",
        "SndrDeviceVer":"1.0.35",
        "CatPurp":"CASH",
        "CurrCode":"MYR",
        "TxnAmt":1000.00,
        "CdtrAgtBIC":"PBBEMYKL",
        "CdtrAcct":"73534278991",
        "CdtrAcctType":"SVGS",
        "RcptRef":"20201102REF0001",
        "PymtDesc":"Transfer via account",
        "IPAddr":"192.0.0.1"
    }, 
        "signature":"mciXO20wtXNvaXnBTqWRNTiqJNKSDZqm2JNTuqxBdUqeRTnhSPcJX/70hF2WIzeS10 
        NnUSjbNloSdzfIrGZIPSSXduzUcIgQZcVrJnUjOeZ/31fqV5DMk6ZpZsQtFSvUuWzkfEsh+m90Ywu28
        ynRV6xjH9bIzonvrTuv2uPxMDi0WgUr0vbNhqRH18AGHnYYKzieMrpkkCEtvybkyzp5s2k3E2FCgZa/
        B7zIBVi/iUcTjFeLn7dIr5e3MEFCZV7teopSdX6gYcdAMnf34MIn33JPeH1mP/O2yAUDtCgRMYyWUgh
        ohWqZYj191VQUfQDeP8l1Bklol97HDsJJ51+0UQ=="
}