Hi there, I have a question, my vps Centos 7 works fine but I recently upload a php script that allows payments with paypal via REST, unfourtnately, always receive next exception:
Fatal error: Uncaught exception 'PayP...
I'm not sure, but I guess PayPal maybe does a reverse check. And if they do, then yes, a self-signed certificate is not allowed.
You either need to use Let's Encrypt (which is free) or buy a certificate.