The world’s biggest retailer isn’t giving Apple a foothold in its sales process just yet.

Walmart Pay

Walmart

Walmart, the world's biggest retailer, has refused to accept Apple Pay, Android Pay and other mobile payment services at its stores for more than a year. Now, it's digging its heels in and launching its own mobile payment system called — what else? — Walmart Pay.

The new checkout option will exist within Walmart's current app, which has 22 million active monthly users, executives told reporters during a live video briefing on Wednesday.

Walmart Pay will conduct transactions by scanning QR codes, versus the tap-and-go technology used by Apple and Google. The new Walmart system will display a code on the checkout screen, which the Walmart app reads using the phone camera. It's similar to the very successful mobile payment system rolled out by Starbucks — although at Starbucks, a code on the phone screen is scanned at the checkout.

Walmart Pay will roll out to a handful markets after the holiday season and launch nationwide in the first half of next year.