According to a press release, the change allows Publix to focus on enhancing, expanding other features of the app.

TAMPA, Fla. — Publix fans may soon be able to get groceries delivered to their door, thanks to a new startup delivery company. "Shipt" delivery is coming to Florida with promises of grocery delivery ...

If you like paying for your Publix groceries using Publix Pay in the app, better enjoy the convenience while you can. It's going away.