Paypal Checkout API System for Recurring Payments

I currently am developing a content management software system where clients can login, update their site, and they're done. All that is great. What I don't have time to handle is the registration and payment process. Visitor goes to my site, chooses from one of 4 plans (all are recurring every month), enters in their payment and registration information, and the payment is processed via paypal's API. There will need to be a trial period of 1 month so the card wont be charged until trial period has expired. All this will need to be tested thoroughly through the paypal sandbox with the trial period on and with it off. Errors will need to be descriptive and accurate, when someone encounters a payment error it needs to display what happened and be logged in a txt log file on the server I can access. The registration information (minus the payment information) needs to then be sent to a mysql database (password will need to be encrypted in DB via md5) and then an email sent to us notifying us the account was created. First Name, Last Name, Email Address, Password, and desired url (more on this in a bit). Finally I will need a system to adjust a few items so there will need to be a [login to view URL] or [login to view URL] file that will contain variables such as toggling trial period on and off as well as the prices for each of the 4 plans so I can later make adjustments without modifying code outside of that file. Desired URL: This one depends on the package chosen. For the entry level packages they have to choose the format: [login to view URL] where mysite is the desired url they chose. However, if they choose one of the higher packages they will be able to choose their own domain name such as: mysite.com. The registration form will need to show the appropriate desired url box for what package they are choosing. That's it, pm me if you have any questions