In many places here in France you can just order online on Carrefour's (or one of the other supermarkets) website and get your stuff delivered to your house, so

In many places here in France you can just order online on Carrefour's (or one of the other supermarkets) website and get your stuff delivered to your house, so that seems like more or less what you're looking for, unless you really want to scan physical items yourself rather than online. Although what most people use is actually the reverse, you order the items online and go fetch them with your car, an employee puts the bags in your trunk and you're on your way. You can either pay online or on site.