Reading coding the official website of them, you can see that typography is: Sans PP (PayPal Sans). That is, a font created by themselves.
Also, I got this extracted from:
http://www.noupe.com/design/paypal-sans-the-new-exclusive-font-for-paypal.html
"Designed exclusively for PayPal by the Klim Type Foundry, PayPal Sans comprises of two sub-families: PayPal Sans Big and PayPal Sans Small, as well as 14 styles. As a custom font, PayPal Sans is something you will see in use exclusively on PayPal website and mobile apps."
https://klim.co.nz/blog/paypal-sans-design-information/Suggested font: PayPal Sans
Edited on Nov 04, 2016 at 15:55 by frd
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