[Shopify] Add a webhook via API.rb

require 'rubygems'
require 'builder'
require 'net/http'

API_KEY, PASSWORD = "your-key", "your-password"
URL = "http://your-shop.myshopify.com/admin/webhooks.xml"

xml = Builder::XmlMarkup.new(:indent => 2)
xml.instruct!
xml.webhook do
  xml.address "http://my-hook-address.com/endpoint"
  xml.topic "orders/create"
end

xml_body = xml.target!
url = URI.parse(URL)
request = Net::HTTP::Post.new(url.path)
request.basic_auth(API_KEY, PASSWORD)
request.body = xml_body
request.content_type = 'text/xml'
response = Net::HTTP.start(url.host, url.port) {|http| http.request(request)}

puts "Request: #{xml_body}"
puts "Response: #{response.body}"