Does your dc's school do this? I only found out this morning that ds2 (yr7) does this to get his lunch. I didn't sign anything to agree to it. DS1 is yr 10 and refuses to do it but I imagine he'll get encouraged forced to do it? He doesn't get library books out and takes in his lunch so hasn't been made to yet.
In theory I think it's a good idea as dcs can put cash into the system and they don't have to take it in all week. And getting library books etc. out is quick. But it does smack of big brother.
Poor ds2 this morning. I gave him £5 yesterday. He only buys a wrap for £1.30 as he takes juice and snacks in. He asked me for some cash this morning and I said he should have money left? He said it doesn't give him change. I said what doesn't give him change? It sounded so futuristic. I went off it as can't afford to lose that sort of cash. Not off it with ds2 but the school. Then ds1 told me it holds the cash and he just has to put his fingerprint on it to get food. Then we top up the amount.