The issue is on the network layer of your application as it could not
locate the SSL certificate. It seems that you have initially did the
suggestions provided by other forums on how to resolve this issue, but
still, the issue is not yet resolved.
Since this issue is more on the SSL certificate on PHP, and not AdWords API
specific, I would recommend that you post your concern here
<https://github.com/googleads/googleads-php-lib/issues> as the library
owners can provide further assistance on PHP client library specific
AdWords API Team
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