PayPal’s banking license is issued in Luxembourg. This means that in addition to other European laws, PayPal must comply with Luxembourg Banking Laws, including banking secrecy.
PayPal publishes this list as required, to ensure that PayPal customers in the EU, EEA and Switzerland who are covered by the Luxembourg banking laws are informed as to which other companies (‘third parties’) may receive their data if they request PayPal services.
Why are so many companies listed?
PayPal has a significant number of customers in the EU, EEA and Switzerland that rely on PayPal to process their payments securely and safely. Providing these services efficiently sometimes requires PayPal to use the services provided by other Companies.
This list also includes companies used by other members of the PayPal Group, including Hyperwallet, Zettle and Xoom.
They say as much here [1]
https://www.paypal.com/ie/webapps/mpp/ua/third-parties-list ↩︎