I connected stripe to my funnel, and Amex, Visa, and Mastercard are available and visible. However I also want to show the payment badge of Discover. Is this possible?
Hi @Cibelle_Limited 
welcome to the community!
Stripe only shows card networks that are active in your Stripe account. Also depends on your region.
If Discover is active in Stripe, normally it should show automatically.
But sometimes it not show. Easy fix → just add Discover logo manually.
Use Funnelish image component. Upload a small SVG icon of Discover. Place it beside the other badges in checkout.
This way customer can see it. Payment will work fine.