title: RestApi call through iron-ajax of polymer
body: <p>I am developing a polymer app and I want to make a call to the RestApi.
  this is the how the request body is</p>
  
  <pre><code>{
      "languageId": Presently English is the only supported language. Always 1, 
      "productCode":"Medicus",
      "timeZoneName":"Time zone name of device. For e.g. Asia/Calcutta",
      "timeZoneOffset": Time zone offset from UTC in milliseconds. For e.g. IST = 19800000,
      "user":{
       "firstName":"First name of the user",
       "lastName":"Last name of the user",
       "middleName":"Middle name of the user",
       "password":"Password provided by the user",
       "userTypeId":2 = Doctor, 3 = User,
       "fields":[
           {
              "Id":1,
              "values":["Mobile number provided by the user”]
           }
       ]
      }
  }
  </code></pre>
  
  <p>i am not getting the proper idea of how i should specify these parameters in the  params='{}' of iron-ajax element.</p>