In January, The Wendy’s Co. said it was investigating possible credit card fraud at some of its restaurants.

The security breach has dogged the company ever since. Last week, the Dublin, Ohio-based quick-service operator said that the breach was far larger than it initially reported, with many more than 300 restaurants affected.

The incident has shed light on the way franchised restaurant operators handle point-of-sale systems and protect credit card data. Wendy’s placed much of the blame for the breach on third-party POS providers used by some of its franchisees. Read more.