Any billing app can show yesterday’s sales. None of them can tell an owner whether the shop earned anything, and eight years of bespoke code had the same blind spot.
Only one leg of each transaction was posted, so healthy shops could show losses in the millions. Stock lived in two conflicting tables. The result had to become a multi-tenant product a shopkeeper could try from a phone.
One Laravel application, nine bounded-context packages, one shared database. Every financial side-effect travels as a domain event into an accounting package that alone is allowed to write the ledger.
Sales, stock, purchasing, replenishment, discounts, accounting, identity, demo, insights and storefront each own their routes, migrations, permissions, React SPA and tests. A context map records where legacy code still crosses a boundary.
Every sale, purchase, return, revaluation or expense fires a domain event that writes a balanced journal entry keyed on its source, so retries never double-post. The POS rejects any sale that can't balance its own journal.
One batch store with oldest-first stock-out, a derived movement log, and a daily rollup at actual cost. Depleted batches are kept and alerts never hidden, so expiry and low-stock reports stay honest.
Organisation-to-shop scoping is enforced where a record is fetched, never after, over five access tiers and a 125-slug permission registry. Record-state rules live in Laravel policies. A salesperson bills without ever seeing a margin.
Name, pharmacy and mobile number provision a private tenant in about two minutes, where every demo transaction posts real books. Customers order by QR code with OTP-verified tracking, and a Flutter sales app shares the API.
Seventeen live pharmacies moved onto balanced books without closing a counter, and a shopkeeper can now try the product from a phone before talking to anyone.
The rehearsal clone was 1.78M out, and one shop showed a 9.1M loss on 1.7M gross profit because legacy purchases were expensed periodically. We wrote a fourteen-step idempotent migration, rehearsed it twice on production clones, and gated go-live on a clean reconciliation.
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