A private key is important for SSL installation and it should be kept privately on your server. You should not expose it to your SSL provider or other users. Sometimes your web hosting company may ask for your private key to create an SSL secure ...
Login to your reseller panel Click on "TOOLS" option In that select "Profile Settings" option Choose "API" option Click on "View API Key" to see the API key
You can move your SSL certificate to a different server, you need your private key on the active certificate. But, if you don't have your private key then you will have to reissue the certificate with a new CSR.