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#1 
this URL can be extract into a constant

and you can have a private method to construct the request URI, for example:

```
private

def request_uri(params={})
  _params = params.map do |k, v|
    "#{k}=#{v}"
  end

  if _params.any?
    "#{URL}?#{_params.join("&")}"
  else
     URL
   end
end
```

^ rough code, but you get the idea