Settings , described below should be done.

SSL settings.

If customer uses https he need to point his SSL-certificate configuration. The next steps should be performed:

Certificate

The certificate customer received after registering an SSL certificate with a trusted certificate authority (it means certificate content).

SSL Chain Certificate

They are optional and contain all of the certificates required to verify the subject identified by the end certificate.

Certificate Key

Also known as a private key. it's needed to encrypt information that's sent out (it private key content). This content must not be shared with anyone except for us.

Also port 443 on customer server should be checked by telnet or nmap.

This port should be opened on customer server. It means that virtual host for SSL should be set up.