A discount giant is helping more shoppers skip the checkout line.

Walmart is expanding the deployment of its Scan & Go mobile app, which is being tested in approximately 12 stores across Northwest Arkansas, Florida, Texas and Georgia. The chain is now rolling out the app for use in at least 10 additional locations in the Dallas-Fort Worth and Nashville markets. The stores will offer the solution by the end of the month, said Walmart spokesman Justin Rushing in an interview with Chain Store Age.

“A lot goes into the market selection, including both the commerce and customer density that make up each area,” he told Chain Store Age. “These are diverse markets to test new ideas. Our initial findings will determine how we will expand the program further.”

The free app allows members to scan merchandise bar codes as they move throughout store aisles and add merchandise to their shopping carts. The app also keeps a running total and itemized list of merchandise and prices, and lets shoppers checkout directly through their smartphone.

In addition to internal metrics, Walmart will also rely on customer feedback to learn from the test.

“This is not the complete solution, it is only a part of multichannel process in the front…