Customers are unable to checkout with Zim Visa/Mastercard


I created a checkout form with a key configured for USD Visa/Mastercard.

We have successfully had people checkout with Visa and Mastercards from various countries. However, we are unable to checkout using a (prepaid) Zim card. We tried 2 different cards from different banks. We know they had sufficient funds. We also tested that they worked on other paynow sites.

On one card, we received the error “Only accepts US Credit/Debit cards”
And on the other card, we simply received the error “Declined”

Should these cards work with the USD Visa/Mastercard selection?