My website already has an SSL certificate but my CC proceesing company is asking this below;

It’s important that you add the following items to your site to ensure compliance with card brand requirements and to give your customers a hassle-free and transparent shopping experience.

1. Secure the Page where your customers’ card information is entered using a valid SSL Certificate

Please be advised we can only accept the SSL Certificate directly from the credit card entry page. If you use email invoicing instead of a website to accept credit card payments, please send a sample invoice with a payment link to *** for review. If neither of these statements apply, please provide additional information about how you accept credit card transactions.