Ruby1.8.5でWebPayのRest APIを使う例。

get_charge.rb

#!/usr/bin/env ruby

require 'net/https'
require 'uri'
require 'rubygems'
require 'json'

url = URI.parse('https://api.webpay.jp/v1/charges/ch_WO14ib0ANJiSHn')
req = Net::HTTP::Get.new(url.path)
req.basic_auth 'vtUQeOtUnYr7PGCLQ96Ul4zqpDUO4sOE', ''
https = Net::HTTP.new(url.host, url.port)
https.use_ssl = true
https.start do |h|
  res = h.request(req)
  obj = JSON.parse(res.body)
  puts obj['id']
end