For what its worth, I got the walmart green dot reloadable visa and it didn't work for me on Intertops (Cake) or on Lock Poker (Merge)...
Might want to try it again... Visa cards from North America are all processed in the US, where VISA blocks all
gambling related transactions. But, what the
poker websites do is create new merchant accounts to charge the credit card to (example, my last Intertops deposit was charged to something called "intnl decorations" or something or other. These new merchant accounts will eventually get blocked, then they just open up another one. So if the card did not work in the past, does not mean it will not work now.