nodejs paypal api integration script

i am sub-contracting for a client, The client is a start-up company looking for integration with Paypal so that they can accept credit cards. All programming of the site is complete and they just need a way for users to pay. They don't need a shopping cart feature. They only have 3 products which are digital downloads. You will need to setup Paypal account and then integrate it into their website so customers can pay them. Also they need a standalone nodejs script that stores each customer purchase in a mysql database.

deliverables:
a way to specify 3 products
integration script
paypal account
standalone nodejs script to store in mysql database

please link to relevant paypal projects from your portfolio