A banker at Franklin National Bank in Rockville Centre, New York, Boyle developed the Franklin Charge Account Plan. This was the first bank-issued credit card, the forerunner of the BankAmericard and the MasterCharge cards (which later became Visa and MasterCard).
It did the Diners Club card, introduced in 1950, one better: the Diner’s Club was a charge card, which required full payment each month. Boyle’s credit card introduced revolving credit, which allowed monthly payments (with interest), revolutionizing consumer credit. By October 1951, the Franklin Charge Card was accepted by 750 merchants. The Franklin slogan “Just Charge It” became a national catchphrase. Boyle died April 30 in New York. He was 88.