HTTPARTY => Install HTTPARTY gem
gem install 'httparty'
Install the Paybook API Gem Using this command into the terminal / cmd:
gem install 'paybook'
Add the gem to your Project
require 'paybook'
Then Instance the Class API passing Our API KEY into the method new
paybook = Paybook::Api.new("API KEY GOES HERE")
Then You Can Execute all the methods inside the class API example:
paybook.user_list