Yes! I have been made aware of this problem today by some of our customers, unfortunately. I've tried a couple of different computers and browsers where the checkout was successful, but on an older Mac (2015) with Safari I get the error message shown...

Yes! I have been made aware of this problem today by some of our customers, unfortunately. I've tried a couple of different computers and browsers where the checkout was successful, but on an older Mac (2015) with Safari I get the error message shown...