UPDATE: here is Cloudflare’s incident report:
Cloudflare outage is affecting access to SOME Shopify Sites from Some locations.
At approx. 5pm on 21/6/22 there was a Cloudflare outage. Cloudflare provides a performance/security layer for Shopify and many other websites.
You may see a 500 error on your site. Your site is still ok, and users in other locations (e.g. NZ) will still be able to purchase.
It will be up in about 30 minutes, but in the mean time you can check status here: