To prepare for the Payment Card Industry (PCI) mandated security upgrade deadline of June 30, 2018, PayPal plans a series of tests to verify that our API endpoints meet the latest security standards. Please see HERE for more details. Please direct any questions HERE
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I have seen some integrations experiencing this very same issue today, can you share the URL, button you are using to generate the error?
I will have a look
I am having this problem in my local development enviornment, But Some of our client told us the same problem is also occured in the live enviornmet for few countries only, but the problem is we dont know for which countries this issue occured.