Additional SSL certificates can be ordered the 1&1 IONOS Shop. Once the SSL Certificate has been purchased, you can begin setup via My 1&1 IONOS.
Log in to My 1&1 IONOS and select Domains & SSL from the My Products menu.
In the Portfolio panel on the right side, click SSL Certificates.
Click the New SSL Certificate drop-down menu and select Order Additional SSL Certificate, which will redirect you to the 1&1 IONOS Shop.
Click the Next button for the desired SSL certificate.
Click the Choose button to add the current SSL certificate to your cart.
You will be taken to the shopping cart where you can complete the order process until you receive a summary of your order.
When you have completed the checkout, you can then begin the Setup of the SSL Certificate in My 1&1 IONOS.