PayPal SSL Errors

Problem

The system will not connect to PayPal® correctly.

Cause

Some PayPal® payment gateway modules require an HTTPS-secured connection to create the link between WHMCS and PayPal correctly.

If the WHMCS installation’s domain does not have a valid SSL certificate, the connection will not work.

Solution

To meet PayPal’s requirements:

  1. Make certain that you have correctly installed an SSL certificate. If you need to purchase an SSL certificate, go to whmcs.com.
  2. Update the WHMCS System URL setting to begin with <https://> in the General tab at Configuration () > System Settings > General Settings.
For more information, see Update the System URL.
system-url ssl paypal troubleshooting-article troubleshooting

Last modified: 2025 July 28