authorize.net ARB integration

I'm currently looking for a programming company who can create two [login to view URL] subscriptions for me. One for a monthly subscription amount and the second for a yearly subscription. They both have different prices. You must review the existing programming and the way it has been set up and modify accordingly to complete the ARB. This includes, also subscription cancellation, and modification of payment information as well. This should be a simple item and you must not delete any existing programming to create the new programming. Any existing programming will be left in place and commented out. Good programming practices are a must with this project and backups of existing pages are required prior to modifying them. This is a very small project to get started, however, it is important for us at this time. Additional projects may follow.