Having just completed a Paypal integration for a Backbone.js app (my.jetbets.us), I can pretty confidently say that what Paypal needs is a much better-documented API to interface with a dramatically simpler set of products/pricing plans.

There are like three ways to do everything with Paypal, but it is never clear which of those ways works with the plan you are on, or which of these ways would be "best" or "simplest" or "cheapest," or even why they are different.

The "Square"-ified home page looks nice but my god they make it hard to use their product.

It's like what people have been saying for years...

PayPal, three things you need to work on: customer service around people's money, better api docs, and above all, a brand new homepage

Shame it now replaces the + in my email address with a space when storing/retrieving it from a cookie.