PUT example using HTTParty.

http-escalation-put.rb

require 'httparty'
 
subdomain='FAKE'
api_token='FAKE'
id='FAKE'
endpoint="https://#{subdomain}.pagerduty.com/api/v1/escalation_policies/#{id}"
token_string="Token token=#{api_token}"
 
data= {    
      name: "New name" 
      }
response = HTTParty.put(endpoint,  
                         :body => data.to_json,
                         :headers => { "Content-Type" => 'application/json', "Authorization" => token_string})
puts response.body