 
                http://de.piksel.tech/ws/ws_mid_roll_ad/mode/json/apiv/5.0?method=put&Use "request" param as post variable for submitting json/xml request payload for all PUT requests.
Updates an existing mid roll ad
{
  "request": {
    "authentication": {
      "app_token": "7cd207c2-6808-11e3-b865-22000a8a28ea",
      "client_token": "d4c1b92c0acb102ba3e10015c5f061d1",
      "user_token": "f277cb9d46e45f67f44de949cdde110f"
    },
    "header": {
      "header_version": 1,
      "api_version": "5",
      "no_cache": true
    },
    "ws_Mid_Roll_Ad": {
      "uuid": "oqh2258b",
      "programUuid": "abcd1234",
      "startTime": 13,
      "type": "linear",
      "url": "http:\/\/www.com",
      "templateType": "vast3",
      "backupUrl": "http:\/\/www.backup.com"
    }
  }
}
            {
  "response": {
    "success": {
      "code": 862,
      "message": "Midroll ad added\/updated",
      "details": ""
    },
    "WsMidRollAd": {
      "MidRollAd": [
        {
          "uuid": "oqh2258b",
          "programUuid": "abcd1234",
          "startTime": 15,
          "type": "linear",
          "url": "http:\/\/www.com",
          "templateType": "vast3",
          "backupUrl": "http:\/\/www.backup.com",
          "dateAdded": "2014-08-05T18:41:31Z",
          "dateModified": "2014-08-05T18:41:31Z"
        }
      ]
    }
  }
}