working button post ruby

  require "net/http"
  require "uri"
  require "json"
  require 'openssl'


          uri = URI.parse("https://coinbase.com/api/v1/buttons")
          http = Net::HTTP.new(uri.host, uri.port)
          
          http.use_ssl = true
          http.verify_mode = OpenSSL::SSL::VERIFY_NONE
          request = Net::HTTP::Post.new(uri.request_uri)
          request.add_field('Content-Type', 'application/json')
          
          button = { 
            :name => 'somename', 
            :type => 'buy_now', 
            :description => "message.", 
            :style => 'none', 
            :custom => @admin_password, 
            :custom_secure => true, 
            :variable_price => true, 
            :price_string => "0.400", 
            :price_currency_iso => 'BTC', 
            :text => "Send to us",
            :choose_price => true,
            :auto_redirect => true,
            :success_url => "#{root_url}",
            :cancel_url => "#{root_url}",
            :callback_url => "#{root_url}/hidden_url"
          }
          request.body = button.to_json

          @API_KEY = 'aaaaaaaaaaa'
          @API_SECRET = 'bbbbbbbbbbbbbbbbbbbbbbb'

          @nonce = (Time.now.to_f * 1e6).to_i
          @message = @nonce.to_s + "https://coinbase.com/api/v1/buttons" + request.body.to_s
          @signature = OpenSSL::HMAC.hexdigest(OpenSSL::Digest::Digest.new('sha256'), @API_SECRET, @message)

          request["ACCESS_KEY"] = @API_KEY
          request["ACCESS_SIGNATURE"] = @signature
          request["ACCESS_NONCE"] = @nonce

          
          response = http.request(request)

          data = JSON.parse(response.body)
          @user.button_code = data['button']['code']
          @user.save(:validate => false)