Apparently PayPal lets junior-level interns design APIs used by millions...

paypals_ipn_designed_by_noobs.rb

  def paypal_business_param
    # as if the name of this type isn't bad enough
    if params[:txn_type] == 'recurring_payment_suspended_due_to_max_failed_payment'
      params[:receiver_email]
    else
      params[:business]
    end
  end

  def paypal_subscr_id_param
    if params[:txn_type] == 'recurring_payment_suspended_due_to_max_failed_payment'
      params[:recurring_payment_id]
    else
      params[:subscr_id]
    end
  end