Things to consider [when developing for an e-commerce site]

• Know when your site proper assets are served as well.
• Always use ssl
• kind of cart system
• kind of user/customer management
• kind of user/admin management
• kind of fulfillment
• kind of subscription
• kind of checkout
• includes discounting/coupon management
• supports transactional email
• has inventory and product detail management
• includes or directly processes types of payment processors