I'm currently building a B2B e-commerce site for a client using WordPress. We sell industrial machinery ranging in the upper $100k-$400k price range. My client would like to have their financing form online where customers/businesses enter bank account information, as well as social security numbers. He wants this form to be emailed to our financing group to process. Instead of emailing this form, could I keep the data on my SSL server and encrypt it some way then provide a login link for our financing group to use, enter a key, then display the sensitive information? We are trying to eliminate the need to fax or mail an application.
We have 2 servers, an in-house MS SQL 2008 server and a MySQL/Nginx server WordPress is installed on.
After reading through many posts, what my client wants to do is a huge risk for users and our company. I'm not a security specialist, just looking for some feedback on what I should/could do.