Popular retailer Costco has been testing checkout technology that members frustrated by the sometimes long lines at its warehouses may be happy to see.

Costco is testing a new Scan & Pay technology that could eliminate long checkout lines by letting shoppers scan and pay with their phones.

Costco is testing a “scan-and-go” checkout system similar to Sam’s Club, allowing customers to scan items with their phones, build a digital cart, and pay through an app. Initial test results have been positive,