To clarify the steps that I used to install Paypal, and link fingerprinter verification to it,
1> To get an actual searchable Samsung App Store, download the “Samsung Apps Mobile” from the phone via www.samsungapps.com or HERE (This BS is what was holding me up)
2> Install the PayPal app via the Samsung App Store (first uninstall the Paypal app if previously installed via Google Play Store)
3> Search and install NNL from the Samsung App Store
4> Open Paypal>Settings>Login Options>Register Fingerprint.
Sent from my SM-G900V using XDA Premium 4 mobile app