Visa finds its credit cards going to pot
San Francisco Business Times (blog)
Many of those "merchant acquirers," which are banks and other card-payment processors, are steering clear of marijuana dispensaries. San Francisco-based Square said its popular payment-processing service would not be allowed for Colorado's marijuana ...
Credit card swipe-fee fight set to enter next round
Card Conundrum Develops in Colorado Over Marijuana Sales
How Tech- And Mobile-Centric Players Are Transforming The Credit Card ...