Enter the shop's details once, then scan the shelves.
Match it with the digits printed under the barcode. Fix any wrong digit.
Fills in from the photos. Or write it as brand · product · weight, e.g. Tata Salt 1kg.
For items with no barcode: karela, peas in pods, khari biscuit… Take 10–15 photos: a different angle each time, some in a heap, in the shop's own light.