def cancel(id)
      have_key?
      address = @url_private
      body = {
        "method"        => "cancel_order",
        "currency_pair" => "btc_jpy",
        "order_id" => id,
      }
      h = post_ssl(address, body)
      {
        "success" => h["success"]==1,
      }
    end
def cancel(id)
      have_key?
      address = @url_private
      body = {
        "method"        => "cancel_order",
        "currency_pair" => "btc_jpy",
        "order_id" => id,
      }
      h = post_ssl(address, body)
      {
        "success" => h["success"]==1,
      }
    end
Cancel an open order
 @abstract
 @param [int or string] order id
 @return [hash]
   success: [bool] status