Checkout not working

Hi,

As of this morning, our customers are getting a ‘Things don’t appear to be working at the moment. Please try again later’ message when taken to the Paypal Checkout page to send payment. (I use your plugin in a number of sites, and it is the same with all of them.)

I have your Premium version, but can’t see how to ask for support, so posting here!

The page I need help with: [log in to see the link]