I got a curious question that I missed while going through implementation of Visa Checkout.
What sort of settings does the Visa Checkout APIKey effect by default when setup? Does it affect what card brands are available, and what merchant account it's linked to? Can it override event parameters set within onVisaCheckoutReady function() for V.Init ?
I'm happy to help answer your Visa Checkout questions. I'll take a look and get back to you soon.