It's very important when you are accepting credit cards inline, to be aware of all of the Payment Card Industry guidelines and requirements, and ensure you are in compliance. SSL alone is not sufficient. You can learn more about PCI here:
www.pcisecuritystandards.org/merchants/
Compliance includes security scans by authorized vendors on your hosting account/server, and documented business processes to ensure that card holder data is securely handled at every point in your business. Failure to meet PCI compliance requirements (enforced by Visa, MasterCard and other credit card companies) can result in fines and loss of merchant privileges. It's important to educate yourself on the requirements and make sure that your eCommerce site is up to the standards.
While we are not a "certified" PCI compliance company, at Polished Geek we have provided consulting and technical services for many store owners to ensure they are PCI compliant with their Joomla eCommerce stores. If you would like to chat about your security needs, just open a ticket in our Client Area:
PolishedGeek.com/clients/contact.php