Why Am I Getting 'SSL certificate problem: unable to get local issuer certificate' When Accessing PayPal?

Unable to Obtain Local Issuer Certificate for PayPal Access SSL Certificate

To access PayPal's services, authentication is crucial. This begins by obtaining a token using cURL and PHP. However, developers often encounter the following error: "SSL certificate problem: unable to get local issuer certificate."

Do You Need SSL for PayPal Access?

Contrary to popular belief, PayPal Access API does not explicitly require SSL. Some may encounter this error without needing SSL.

Why Does This Error Occur?

The error typically arises due to PHP's default behavior. PHP 5.3.6 and earlier versions do not automatically validate SSL certificates by default.

Solution

To rectify this issue, update your PHP setup to PHP 5.3.7 or higher. Additionally, download a current list of certificate authorities and include it in your php.ini:

curl.cainfo=<path-to>/cacert.pem

Restart your web server, and you should be able to obtain the necessary certificate without encountering the error.

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