Public IP SSL Files
For Public IP SSL, Apache, Nginx, and IIS use the same Private Key generated with the CSR.
WARNING
Do not generate or download a new key from the product page. Use the original Private Key.
Apache
Use the certificate, Private Key, and CA bundle.
Nginx
Use the full-chain PEM file and Private Key.
See: Create a PEM File for Nginx
IIS
IIS usually uses a PFX file:
bash
openssl pkcs12 -export -out example.com.pfx -inkey example.com.key -in example.com.crt -certfile ca-bundle.crt