From the Main Menu, Click on Settings -> Settings -> System Settings.
From the System Settings Menu, Click on 3rd Party Integration.
Click on Stripe.
Check Enable Stripe Integration.
Secret Key: Your Stripe Secret Key.
Publishable Key: Your Stripe Publishable Key.
Where do I find my Stripe Secret Key and Publishable Key?
You can find your Stripe Secret Key and Publishable Key by logging in to your Stripe account.
If you are unable to find this information, please contact Stripe.