Conversion of `curl -d 'grant_type=client_credentials&client_id=#{ api_key }&client_secret=#{ api_secret }' "https://api.gettyimages.com/oauth2/token"`

xco.rb

require 'net/http'
require 'uri'

uri = URI.parse 'https://api.gettyimages.com/oauth2/token'
req_options = {use_ssl: true}
request = Net::HTTP::Post.new uri
params = {grant_type: 'client_credentials',
          client_id: ENV['API_KEY'],
          client_secret: ENV['API_SECRET']}
request.body = URI.encode_www_form params

response = Net::HTTP.start uri.hostname, uri.port, req_options do |http|
  http.request request
end