protected override string CreatePayload()
{
XNamespace ns = "http://schemas.microsoft.com/windowsazure";
var doc = new XDocument(
new XDeclaration("1.0", "utf-8", ""),
new XElement(ns + "CertificateFile",
new XElement(ns + "Data", Base64CertificateData),
new XElement(ns + "CertificateFormat", "pfx"),
new XElement(ns + "Password", PfxPassword)));
return doc.ToStringFullXmlDeclaration();
}