Customer passbook. Customers sign in with a phone number and an OTP to see every installment they've paid, and download a PDF statement.
Books that can't be quietly edited. Counter payments clear the oldest due installment first onto gapless numbered receipts, scheme rules are versioned so a customer's terms never change after they sign up, and every financial action is logged with actor, timestamp and before/after. Nothing can be hard-deleted.
WhatsApp reminders ahead of each due date, with a pay link attached. Falls back to SMS when the message doesn't land.
Host onboarding opens on the Ha Giang Loop — first operators listing their trips.
Spreadsheet import for shops moving off paper. Running schemes arrive with their paid history, so dues and maturity dates are right on day one, and the import either commits whole or not at all.
That's everything since we started publishing. Earlier work went out before the changelog did — the gap is real, not an archive we're hiding.
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