Using Bitwarden for apps on my phone

How do I get Bitwarden to use the same password for apps on my phone as it does on the app’s website (e.g. PayPal)?

In order for Bitwarden to detect the app correctly, the entry in your vault needs to include the correct URI.

https://bitwarden.com/help/article/uri-match-detection/#uri-schemes

according to the above page, the URL for the PayPal android app would be - androidapp://com.paypal.android.p2pmobile

Do I need to add every app in there? Or when I first sign into an app with BitWarden save the password like it does for websites?

If you ask Bitwarden to fill a site or app with a saved password and it doesn’t already have a matching URI, you should see an option called “auto-fill and Save” which will add the URI to that vault entry.