PayPal RESTful API Payment Module

[lat9]

I have a question.... I noticed that sometimes when you check out and the paypal window popup up. If I click on guest checkout and put an email address in it just keeps spinning. This happens a lot but not all the time. Is this a paypal issue or a zencart issue.

You've not provided enough information to determine whether the source of the issue lies with PayPal or Zen Cart. If you activate your browser's Developer Tools (by pressing F12 on a Windows computer) and view the "Console" tab, that will show any javascript/jQuery type issues going on.