Amazon S3 or Amazon Simple Storage Service is a service offered by Amazon Web Services (AWS) that provides object storage through a web service interface.
Websites that have a shopping cart or checkout page, either using a known ecommerce platform or a custom solution.
HTTP Strict Transport Security (HSTS) informs browsers that the site should only be accessed using HTTPS.
Magento is an open-source ecommerce platform written in PHP.
Mailchimp is a marketing automation platform and email marketing service.
reCAPTCHA is a free service from Google that helps protect websites from spam and abuse.