Khata without the notebook

Almost every counter in India runs credit, and almost none of it is written down twice. There is a diary, or a register, or a note on the phone, and it works — right up to the day the person who keeps it is not there, or the customer remembers the number differently.

The problem with the notebook is not accuracy. It is that it answers only one question, "what does this person owe", and only if you are holding it. It cannot tell you who has been carrying a balance the longest, which is the question that actually gets money back.

A balance, and how old it is

A house account in Keystonne is one running balance per customer: every credit sale adds, every repayment subtracts, and the number is the same number at the counter and in the report.

The part the diary cannot do is age it. Balances group into 0–7 days, 8–30, 31–60, and 60-plus, counted from the *oldest unpaid bill* rather than from the last time anyone looked. Two customers owing ₹6,000 are not the same customer if one of them started owing it last Tuesday and the other in May.

That is also why the total sits beside the buckets. The total tells you the exposure. The buckets tell you where to spend the phone calls.

Reminders that go without being remembered

Collections fail on effort, not intent. Nobody decides to stop chasing a balance; the week just fills up.

So a reminder is one tap from the row that shows the balance, sent over WhatsApp — where your customer already is, rather than an SMS they will not open or an email they do not have. It carries the amount and the age, because a reminder that does not say what it is about invites a reply asking.

A limit you can see being crossed

You can set a credit limit per customer. When an account reaches or passes it, the row is flagged and the account is called out above the table.

It flags; it does not block the till. That is a deliberate description, not a softening: nothing in the billing path refuses a sale because of a limit. The account surfaces so a human can decide, with the number in front of them, whether the next round goes on the khata. In a shop where the person at the counter knows the customer, a hard stop is often the wrong behaviour anyway — but you should know which one you are getting, and the screen should not imply the stronger thing.

The bit that makes it a ledger

Credit that is not reflected in the books is a hole with a number next to it. A credit sale is still a sale: it appears in the day's sales, in the GST register, and in the receivables — so the day's cash and the day's sales stop disagreeing without an explanation.

That is the difference between recording credit and merely remembering it.

The honest limits

- This is not lending. There is no interest, no scoring, no credit product. It is a record of what a customer already owes you, which is a bookkeeping question. - Reminders need WhatsApp configured. With no messaging credentials set, the balance and the ageing still work; the reminder button is what waits. - A limit is a flag. Repeated because it is the one place this feature could be read as stronger than it is.

The test for any of this is not whether the screen looks tidy. It is whether the person who normally keeps the diary can take a day off.