The banner team's design consultants, Trilogy Interactive, indicate that they've seen a lift from other clients when moving to an interface that more closely mirrors the physical spacing and layout of donors' credit cards.
Here's our current form; here's a cool mockup.
This is controlled on the PSP side. @Ppena would have to negotiate this with each processor
AFAK this can be controlled by us if we use a different kind of integration, like Client side encryption (Adyen) or Silent post (WP). I dont remember whats called in Ingenico. That's why we engaged this companies to eventually have control over this part of the form. We are currently blocked by our current PCI set up.