If your "Payload URL" is a secure site (HTTPS), you will have the option to configure the SSL verification settings. If your "Payload URL" is not secure (HTTP), GitHub will not display this option. By default, GitHub verifies the SSL certificate of your website when delivering webhook payloads. SSL verification helps ensure that hook payloads are delivered to your URL endpoint securely. You have the option to disable SSL, but we recommend keeping Enable SSL verification selected.