There are different types of SSL certificates.
The leading practice is to use Option 1 to generate a CSR for a subdomain SSL certificate for your customer’s career site. Option 1 may not be used to generate a CSR for a wildcard certificate. Wildcard certificates are supported, but are not the leading practice as it involves the risk of compromising the required private key for SSL installation. When following the recommended process (Option 1), SAP has the private key, so there is no issue with compromising the private key in transit.
If the customer desires the use of an existing wildcard certificate, use Option 2 to upload it, along with the private key. Wildcards became popular for fluid websites that are not permanent. For a permanent, known domain, customers should have a proper registered SSL certificate instead of a wildcard certificate. For more information, see SAP Knowledge Base Article(KBA) 2809025 - SSL installation using wildcard certificates - Recruiting Marketing (2809025 - SSL installation using wildcard certificates - Recruiting Marketing).