Square has lost its head of payments, Mary Kay Bowman, to Visa, where she takes on the role of Head of seller solutions.
Bowman is the second senior departure for Square in a month, following the exit in December of chief financial officer Sarah Friar for Nextdoor.
Bowman joined Square in 2015 after 11 years at Amazon, where she was a director of global payments.
In her new role she will lead Visa’s strategy for acceptance products and services to "transform the payment experience for both sellers and consumers".
Says Visa: "This is a critical role, as the point of sale is undergoing dramatic change as it shifts from traditional payment acceptance to digital, cross-channel payment experiences."