We have square installed in our reservation system, everything was going well until today, with the API a payment link was generated and the user was redirected to this link, this makes it correct, but the square page of the payment link is now visible blank, do you have any problem on your part? Because it has been working perfectly for months and just today it stopped working for no apparent reason.
Do you have an example link that’s not working? Also what’s the application ID that created the link. 
I have the same issue. Empty screen. When I reloaded the page I saw Cloudflare page.
My ID is sq0idp-ZgnWKKWRdXVHHEAtMJDQqw
Is your page HTTPS? Is it hosted so we can inspect?
The error was solved, apparently it was a problem in your systems:
Glad to hear that it’s working as expected now.