It is 11:14pm. You have shipped fourteen orders today and you are answering the fifteenth version of the same question, by hand, on your own phone. You open the courier site, copy an AWB number, paste it into WhatsApp, type "out for delivery tomorrow", and move to the next chat.
None of that work made you a rupee. It is pure overhead — and it scales linearly with your success. Twenty orders a day is twenty status conversations. A hundred orders a day is a full-time job you did not hire for.
Then there is the cost you cannot see. A buyer who does not hear from you for three days assumes the order is lost. They open a dispute, or they charge back, or they simply never come back. Silence after checkout is the single cheapest way to lose a repeat customer, and almost every small store in India is doing it by default.
Email does not fix this. Indian buyers do not read commerce email — it lands in Promotions and dies there. SMS costs money per message, gets filtered by DLT rules, and cannot carry a clickable tracking link reliably.
WhatsApp is where the conversation already is. The buyer gave you their number at checkout. They have the app open. They will read the message within minutes. The only reason every store is not already automated on it is that wiring the Business API up yourself means a Meta business verification, a BSP contract, template approvals and a webhook server.
That is the part Dukaan already did. You get the switches.