Amazon Pay is an online payments processing service that is owned by Amazon. It lets you use the payment methods associated with your Amazon account to make payments for goods and services.
Websites that have a shopping cart or checkout page, either using a known ecommerce platform or a custom solution.
Google Tag Manager is a tag management system (TMS) that allows you to quickly and easily update measurement codes and related code fragments collectively known as tags on your website or mobile app.
Klarna Checkout is a complete payment solution where Klarna handles a store's entire checkout.
Nginx is a web server that can also be used as a reverse proxy, load balancer, mail proxy and HTTP cache.
OXID eShop Enterprise Edition is a B2B or B2C ecommerce solution built using object oriented programming and PHP.
reCAPTCHA is a free service from Google that helps protect websites from spam and abuse.
Varnish is a reverse caching proxy.