def default_params(h = {})
      raise ArgumentError, 'Default params must be an object which responds to #to_hash' unless h.respond_to?(:to_hash)
      default_options[:default_params] ||= {}
      default_options[:default_params].merge!(h)
    end
def default_params(h = {})
      raise ArgumentError, 'Default params must be an object which responds to #to_hash' unless h.respond_to?(:to_hash)
      default_options[:default_params] ||= {}
      default_options[:default_params].merge!(h)
    end
Allows setting default parameters to be appended to each request.
 Great for api keys and such.

   class Foo
     include HTTParty
     default_params api_key: 'secret', another: 'foo'
   end