Best way to setup your paypal. Same goes to setting up user paypal payment method.
- Go to REST API apps section and click the Create App button.
- Add your own details for the new app and create it.
- Switch to Live by clicking the button near your new App's Name.
- Copy the Client ID and Secret
- Navigate to "Admin / Plugins / Payments Addon" & edit paypal & input your copied Client and Secret keys.
- Make sure to also switch the Mode to Live and Submit the new settings.