JWT claimset

gistfile1.cs

// jwt claimset
var issueTime = _dateTimeConverter.ToUnixTimeStamp(date);
var expiryTime = _dateTimeConverter.ToUnixTimeStamp(date.AddMinutes(60));

var claim = new
{
    iss = serviceAccountEmail,
    scope = "https://www.googleapis.com/auth/bigquery",
    aud = "https://accounts.google.com/o/oauth2/token",
    iat = issueTime,
    exp = expiryTime,
};

//encoding
var claimBytes = Encoding.UTF8.GetBytes(_jsonProvider.Serialize(claim));
var claimEncoded = _base64Encoder.ToBase64UrlEncodedString(claimBytes);