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var method = pm.request.method;
var uri = "/v1" + pm.request.url.getPath();
var accessKey = pm.environment.get("access_key");
var secret = pm.environment.get("secret");
var timestamp = new Date().toISOString();
var message = method + "\n" + uri + "\n" + timestamp;
var hash = CryptoJS.HmacSHA256(message, secret);
var hashInBase64 = CryptoJS.enc.Base64.stringify(hash);
authen = "TV " + accessKey + ":" + hashInBase64;
Trust Vision provides application to test on (please contact Trusting Social for access key id and access key secret):