Zerto Analytic API authentication bad request erro

Hi All,

I am trying to collect the status of all VPG from zerto analytics API in google spreadsheet using google script .

While running below code , getting error “Request failed for https://analytics.api.zerto.com returned code 400. Truncated server response: {“errorCode”:4,”errorMessage”:”Bad Request”}”

Code :

function vpgStat() {

var Username = ‘username’;
var Password = ‘password’;

var API_URL = ‘https://analytics.api.zerto.com/v2/auth/token’;

var options =
{
method: “POST”,

contentType: “application/json”,

headers:{
Authorization : “Basic” + Utilities.base64Encode(Username + ‘:’ + Password)

},

};
var response = UrlFetchApp.fetch(API_URL, options);

}

Can someone help me  to identify the error.

Thank you in advance.

Regards,

Sagar