Child class

class CoolClass < MyService
  
  api CoolClassApi

  def service_params
    params.slice(
      :some_junk
    )
  end

  def build_user
    user = get_weblinc_user
  end

  def build_order
    order = get_weblinc_order
    # manipulate order
  end
end

Parent class

class MyServices
  attr_accessor api
  attr_reader return

  def self.api(api)
    @api = api
  end

  def initilize(objects, params)
    @objects = objects
    @params = params
    objects.each do |object|
      define_method("get_#{x.class.name.underscore}") do
        return object
      end
    end
  end

  def process(persistent = false)
    @return = call_service
    build_objects
    object.each(&:save!) if persistent
    objects
  end

  def call_service
    api.new(service_params)
  end

  def build_object
    objects.each { |x| send("build_#{x.class.name.underscore}")}
  end

  def parse_response
    # not implemented error
  end 
end

right on