Hi! I am testing wordpress website and after clicking on "Buy" button my website redirects me to PayPal Sandbox checkout login page (https://www.sandbox.paypal.com/webapps/hermes?token=6UT88176PL354821T&useraction=commit&rm=2&mfid=15...). Then it loads very long and after of a minute of loading it gives me an error "Things don't appear to be working at the moment. Please try again later."

Can you tell me what I do wrong or may be this is some kind of PayPal error.

Any help apriciated!