My update to my last post in the same thread. I just saw this in one of the advertisement of tge said apps and it so cool. I am thinking this is not very useful tho, because most of the people who but goods in the markets are most commoners and we can say that tech is not in their first priority. But thinking again, my mom is also now a techie and she buy her ingredients to the market. But she still uses her traditional way of paying, physical money. Maybe someday it will be widely use.