I want to know why these places don't simply dramatically drop the accuracy requirement.
Rather than giving itemized receipts, give just a total dollar value. Then just make sure that most customers are charged within 10% of the correct amount.
Only if the customer requests and itemized receipt, then go watch the video and generate them one. But after a while most customers won't request it, and that means you can just guess at a dollar amount and as long as you're close-ish (which should be easy based on weight and past purchase history), that's fine.
Rather than giving itemized receipts, give just a total dollar value. Then just make sure that most customers are charged within 10% of the correct amount.
Only if the customer requests and itemized receipt, then go watch the video and generate them one. But after a while most customers won't request it, and that means you can just guess at a dollar amount and as long as you're close-ish (which should be easy based on weight and past purchase history), that's fine.