Accessing the stock "Samsung Apps" through the "Galaxy App" widget directs to a completely different, unsearchable store. Why why why Samsung? See Attached screenshots (one searchable, one not)
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
(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.
Not sure if this is going to work, but here are some backup .apk's I just made from my phone, and put em on Google Drive.
Searchable Samsung App Store APK
PayPal App from the Samsung Apps Store
Nok Nok NNL app