Walmart Inc. has filed a lawsuit against BJ’s Wholesale Club Holdings Inc. for allegedly stealing technology related to a self-checkout option in the Sam’s Club mobile app, CNBC reported Wednesday. What Happened Walmart and its big-box warehouse subsidiary Sam’s Club accused BJ’s of using the technology in its contactless offering ExpressPay, launched last year. “Express Pay is an apparent copy of Sam’s Club’s Scan & Go, merely changing the in-app colors and changing the name from Scan & Go to Express Pay,” the lawsuit said, as per the report. The lawsuit—filed in a US District Court in Orlando, Florida—reportedly accuses BJ’s of infringing on Walmart’s patent rights, thereby causing “significant damages and irreparable harm.” Why It Matters The “Scan & Go” app feature allows Sam’s Club customers to make purchases on their smartphones and bypass the traditional checkout line while shopping in-store. Warehouse club operators like Sam’s Club and BJ’s have …