We’re integrating Paypal’s Web Payments Pro into a new e-commerce site we’re building. To test, we set up our Paypal Sandbox account and began the process of setting up the Web Payments Pro account that we’d need. Interestingly, when I got to the part when it asked for a social security number, it wouldn’t validate the number. Also, there was no business owner address displayed there, which I believe was the cause of the issue. After about an hour and change on the phone trying to talk to the right technical person at Paypal, I was finally told that I could put in a fake social security number, as long as it began with ‘111’. Wow, awesome. Off and running. Now wouldn’t that be useful information in the development docs or maybe even on the site?