Shopping Cart (Portobello)
Learn how to adjust display options for the Shopping Cart in this section. In your control panel, go to Storefront > My Themes, and click the blue "Customize" button to launch Theme Editor. In the left hand column of the Theme Editor, click the panel labelled 'Shopping Cart'
Show Payment Method Icons in the Cart
This will show payment methods in the mini cart and cart page, below the checkout buttons.