My bookselling enterprise went out of business as of December 2017.
While still in business my site used an order form for customers to request information, products, and services. I requested visitor's contact information (name, address, and email address) and financial information (payment information to make purchases). Contact information from the order form was used to ship orders to customers. The customer contact information was used to contact the visitor when necessary. Financial information that was collected was used to bill the customer for products and services.
The web site had and still has security measures in place to protect the loss, misuse and alteration of the information under my control. I used 128-bit SSL encryption to protect customer financial information.