Wordpress Shopping Cart Integration

I want to integrate shopping cart to my site [login to view URL] Requirements -- 1) You will integrate the paypal BUY NOW button for the 2 packages listed at link - [login to view URL] (I am getting a proffessional to re-do the sales page). End user must have an option to pay via credit card or paypal 2) An automatic email will be sent to the subscriber once he pays. This email will contain one of the access ids from a list of pre-generated access id and password for SAP. 3) After payment via paypal user will be re-directed to a page (I will create this page in while) which contains details to download the SAP front end , required to access the SAP system. 4) The subscription will be auto-recurring , though the end user will have a facility to turn it off 5) If auto-recurring is turned off , an subscription expiry email notification will be sent to the user towards the end of the subscrition period 6) In the back-end of wordpress system , I should get various details about the orders made (wp-ecoomerce does this job) 7) For support I would need a ticketing