title: PayPal Sandbox Express Checkout - "You've been inactive for a while, so we logged you out"
body: <p>I have code to handle the PayPal Express Checkout for invoices on our site, basically a version of this:</p>
  
  <p><a href="https://developer.paypal.com/demo/checkout/#/pattern/server" rel="nofollow noreferrer">Paypal Checkout Integration</a></p>
  
  <p>This code was working fine earlier this week. But now when my PayPal button opens the window to log into PayPal, I am getting this message from the PayPal sandbox site: "You've been inactive for a while, so we logged you out to help protect your account." This has happened to me on Chrome and Firefox. I cleared my cookies out on Chrome and still got the message. I logged into crossbrowsertesting.com and tried it on Firefox there and still got the message. My code hasn't changed since I tested it earlier this week. Does anyone have any suggestions for what's going on and what I can do about it.</p>