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Level 4

I got this one working. below is the code on the personalized block if anyone interested

<%

  loadLibrary("wp:base64.js");

  var _email= recipient.email;

  var _id = recipient.id;

  var url = "id=" + _id + "&email=" + _email;

%>

<%@ value object="provider" xpath="@trackingURL" %>/webApp/tstPreferenceCenter?params=<%=escapeUrl(Base64.encode(url))%>

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