Get MasterCard's native currency exchange rates

MasterCard.rb

require 'open-uri'
require 'nokogiri'

baseCurrency='AUD'
settlementDate=(Date.today - 4).strftime("%m/%d/%Y")
finalCurrency='USD'

url="https://www.mastercard.com/psder/eu/callPsder.do?service=getExchngRateDetails&baseCurrency=#{baseCurrency}&settlementDate=#{settlementDate}"
doc = Nokogiri::HTML(open(url))
rate = doc.xpath("//transaction_currency_dtl/alpha_curency_code[text()='#{finalCurrency}']/following-sibling::conversion_rate").text

puts "1 #{baseCurrency} => #{rate} #{finalCurrency}