module HTTParty::ClassMethods

def default_params(h = {})

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

Great for api keys and such.
Allows setting default parameters to be appended to each request. 
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