un metodo que mediante el token_boleta, me lea un archivo en pdf y me traiga el numero de boleta

#!/bin/env ruby
# encoding: utf-8

require 'httparty'
require 'json'

class Pdf2Json
  include HTTParty
  base_uri "https://pdftables.com/api"
  attr_reader :pdf, :token

  def initialize(pdf, token)
    @pdf = pdf
    @token = token
  end

  def convert
    options = {
      :body => {
        :f => "json",
        :token => @token,
        :data => File.read(@pdf)
      }
    }

    response = self.class.post('/', options)
    JSON.parse(response.body)
  end
end

if ARGV.length < 2
  puts "Usage: #{$0} pdf_file pdftables_token"
  exit 1
end

pdf = ARGV[0]
token = ARGV[1]
converter = Pdf2Json.new(pdf, token)
puts JSON.pretty_generate(con