function generateAuthHeader(dataToSign){
var hash = CryptoJS.HmacSHA256(dataToSign,environment["api-secret"]);
pm.globals.set("variable_key", "variable_value");
return hash.toString(CryptoJS.enc.Base64);
}
var date = new Date().toGMTString();
var dataToSign = "(request-target): get " + environment["gateway-url"] + "groups\n" +
"host: " + environment["gateway-host"] + "\n" +
"date: " + date;
var hmac = generateAuthHeader(dataToSign);
var authorisation = "Signature keyId=\"" + environment["api-key"] + "\",algorithm=\"hmac-sha256\",headers=\"(request-target) host date\",signature=\"" + hmac + "\"";
postman.setEnvironmentVariable("authorisation",authorisation);
postman.setEnvironmentVariable("currentDate",date);
