To configure Stripe EPS:
- Install, Activate, & Enable Stripe Checkout EPS Extension
- From Manage, go to Store > Extensions
- Select Payments from Category in Store Extensions section.
- Find Stripe Checkout EPS and Click Settings Cog Icon
- Provide your test or live credentials: Publishable Key and Secret Key
- Click Update
How do I find my Publishable Key & Secret Key
See: https://stripe.com/docs/keys