oscommerce 2.2 paypal recurring payments integration

Please only bid if you have completed jobs here and have a rating of 9 or more. Looking to have the ability to take recurring payments on certain purchases in my oscommerce 2.2 shopping cart based upon the month # as set in the attributes section. Need to be able to allow for the admin to change the frequency of payments without the need for us to pay paypal any type of a monthly subscription.