VIP offers two options for TLS certificates: 1) Let’s Encrypt (recommended) or 2) custom certificates. More details on both are available here.
If you’d like to use a custom certificate, you will need to contact VIP support at least five business days prior to launch to generate the necessary information to procure the certificate, then share it with VIP support so that we can install it for you. More details on getting and using a custom certificate are available here.
If you’d like to use a Let’s Encrypt certificate, you will be able to add one to your site via your VIP Dashboard as soon as DNS is pointed to VIP Go.