Dynamically control Model.Save to use ActiveRecord or ActionWebService

I have "requirement" to support a short term approach using ActiveRecord.Save, but eventually migrate to a SOA environment.
Hence, I need to short-term with ActiveRecord and long-term with ActionWebvService.

Right now, I've got a Controller that looks like

class OfferRenewalController < ApplicationController def handle_payment

    # Receive the ContractPayment "form fields" into an object     @contract_payment = ContractPayment.new(params[:contract_payment])     if (@contract_payment.valid?)

      @contract_payment.save

    else

      # @contract_payment.errors.each_full { |msg| puts msg }       render :action => 'take_payment', :id => @contract_payment     end

  end # handle_payment

class ContractPayment < ActiveRecord::Base end

And this works great for the short-term. How do I override the built- in save method and conditonally use the "normal"ActiveRecord .save vs. invoke some other WebService. I tried a dozen things and just confused the hell out of myself. I would really appreciate a code example with some explanation.

Thanks, Jason