Hey guys, I had the same problem for a couple of days. And I try this method several minutes ago and it works. I believe one of the reason of the problem is the connection, maybe paypal think that your connection isn't safe for a transaction so the system block you. I use PC with wifi to try to do some purchase but always fail because that "Sorry, we can’t complete your purchase at this time Please return to the merchant." message always come out. So I try using my phone and phone signal service provider and surprisingly it works, I can purchase the item. Hope this solution works for you too guys.
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