anchor.diff:                  "completed": true,
                   "download_url": "http://..../request-10.zip"
               }
  +
  ++ Response 500 (application/json)
  +
  +        {
  +            "code": 500,
  +            "message": "User key is invalid.",
  +            "data": null
  +        }
  +
  ++ Response 404 (application/json)
  +
  +        {
  +            "code": 404,
  +            "message": "Invalid template id.",
  +            "data": null
  +        }
  
positive.code:     + key (string, required) - User API key.
      + id (number, required) - ID of request
  
  ### Details [GET]
  
  + Response 200 (application/json)
  
  
negative.code:             "data": null
          }
  
  ## Informations [/api/request/{key}/{id}]
  
  Returns details about request including. When request is completed, it will include link to download generated documents.
  
  