1mdPcQyM

1var crypto = require("crypto-js");
2pm.globals.set("SecretKey", "key");
3var key    = pm.globals.get("SecretKey");
4
5var payload = {
6        "vendor": {
7            "email": "",
8            "firstName": "",
9            "lastName": ""
10        },
11        "purchaseId": "12345678"
12    };
13
14var payloadString = JSON.stringify(payload);
15var payloadUTF8   = crypto.enc.Utf8.parse(payloadString);
16var payloadBase64 = crypto.enc.Base64.stringify(payloadUTF8);
17pm.environment.set("Payload", payloadBase64);
18var signature       = crypto.HmacSHA256(payloadUTF8, key);
19var signatureUTF8   = crypto.enc.Utf8.parse(signature);
20var signatureBase64 = crypto.enc.Base64.stringify(signatureUTF8);
21pm.environment.set("Signature", signatureBase64);
22	
23// payload is JSON object which matches the above.
24var payloadString = JsonConvert.SerializeObject(payload);
25byte[] bytes = Encoding.Default.GetBytes(payloadString);
26var payloadUTF8 = Encoding.UTF8.GetString(bytes);
27	
28static void Main(string[] args)
29        {
30            var secretKey = "secret";
31
32            var payload = new
33            {
34                vendor = new
35                {
36                    email = "",
37                    firstName = "",
38                    lastName = ""
39                },
40                purchaseId = "12345678"
41            };
42
43            string payLoadString = JsonConvert.SerializeObject(payload);
44            byte[] payLoadUTF8 = Encoding.UTF8.GetBytes(payLoadString);  //NOTE:  C# uses UTF-8 by default, so You could have as easily said Encoding.Default.GetBytes();
45            string payLoadBase64 = Convert.ToBase64String(payLoadUTF8);
46
47            string signatureBase64 = null;
48            using (HMACSHA256 hmac = new HMACSHA256(Encoding.Default.GetBytes(secretKey)))
49            {
50                byte[] hash = hmac.ComputeHash(payLoadUTF8);
51                signatureBase64 = Convert.ToBase64String(hash);
52            }
53
54            Console.WriteLine($"payLoadBase64:t{payLoadBase64}");
55            Console.WriteLine($"signatureBase64: t{signatureBase64}");
56            Console.ReadLine();
57        }