I have some problem since several month, with Google Chrome Browser, when someone want to make a checkout, paypal return us an error 500. The error given are "POST [lang]/paypal/transparent/response/ HTTP/1.1" 500.
After some tests, i don't get this error with Firefox, Opera or Microsoft Egde, i've found some hint on google, but nothing work. My current Magento version are 2.2.8. I know it's a bit old. Someone get this problem and found a way to resolve it?