Apache is a free and open-source cross-platform web server software.
Facebook pixel is an analytics tool that allows you to measure the effectiveness of your advertising.
Open Graph is a protocol that is used to integrate any web page into the social graph.
PayPal is an online payments system that supports online money transfers and serves as an electronic alternative to traditional paper methods like checks and money orders.
Trusted Shops is a company that acts as a 3'rd party representing the common interests of both consumers and retailers.
YouTube is a video sharing service where users can create their own profile, upload videos, watch, like and comment on other videos.