Can someone's Venmo/PayPal balance be approved to show up in a 3rd party app?

If I create my own app, can I get a user to authenticate their Venmo/PayPal OR allow access to their Venmo/PayPal, so that their balance shows up on their account on my app? I want to be able to pay users within my app, and have their Venmo/PayPal balance reflect that change. Without them needing to leave my app to check their Venmo / PayPal app to see if the payment arrived.