Back in the old days cash, coin or bartered goods were the currency of choice. The transfer of value was direct, passed between hands that were known to each other and trusted. This all changed across the last century with the introduction of non-physical money transfers. First there were telegraph transfers, then credit cards, Automated Clearing Houses and, most recently, the introduction of online banking, mobile wallets and contactless payments.
Each step forward has made it easier to move digital monies around, but at the rate of digital adoption, the now established payment architectures are archaic leaving the businesses they were built to enable dealing with extra layers of complexity, risk, middle-men, and additional fees while their consumers face clunky checkout experiences.