code: def refunds
        response = Charge.get(URI.parse(PinPayment.api_url).tap{|uri| uri.path = "/1/charges/#{token}/refunds" })
        response.map{|x| Refund.new(x.delete('token'), x) }
      end
docs: Fetches all refunds of your charge using the pin API.
  
   @return [Array<PinPayment::Refund>]
   TODO: pagination