1. Open the Paypal Developer dashboard website
and login with your normal Paypal username/password. (Note: it is of no use to log into your usual Paypal website where you see payments etc, you will not find the keys there)
2. Look in the menu to 'My Apps & Credentials
'. Make sure the toggle is set to 'Live'.
3. Navigate to the REST API apps
section and click Create App
4. Make sure that you are in the 'Live' environment. Name the App 'Sayl Retail app' and click Create App
5. You will see a client ID
and a secret
for your newly created app.
PS. This is also explained on Paypals website