 Brazilian food retailer GPA SA plans to open its first store to test technologies such as facial recognition and scan go shopping by year-end, following in the footsteps of parent company Casino, which opened a checkout-free store in Paris last November. The Sao Paulo-based store, which will use technology from Microsoft Corp, makes GPA the latest supermarket chain to experiment with formats similar to Amazon.com Incs Amazon Go checkout-free convenience stores the Web-based retailer has rolled out in the United States. The GPA store will also follow a partnership struck in March by rival Carrefour Brasil to set up a fully automated 24-hour convenience store with local startup Zaitt. 