Because every Magento install differs, this is build-to-order. After a short scoping call to confirm your version (Open Source vs Adobe Commerce), POS front end, payment gateway, and inventory model, typical delivery is about one working week: build on a staging copy, joint testing including simulated outages, then a supervised production install. Complex MSI or multi-store setups may extend this — we give you a firm timeline before you pay, not an instant download.

Delivery includes a post-deployment support window for bug fixes and questions, plus the documented runbook for handling flagged stock conflicts. Because you receive and own the source code under app/code, you are never locked in. We also offer optional ongoing maintenance to re-verify the module against future Magento and Adobe Commerce upgrades, since core inventory and API behaviour can change between versions.

No. Each offline sale gets a client-generated idempotency key, so replaying the queue on reconnect — whether triggered by the reconnect handler or the cron safety net — creates each order exactly once, even on a flaky link. Stock is reconciled through Magento's inventory service contracts; if two registers sold the last unit while offline, the system flags the oversell in the admin queue grid for review rather than silently corrupting quantities.

Yes to both editions. We build against your specific version and target Magento's service contracts and inventory APIs rather than patching core, so it stays upgrade-safe. On versions with Multi-Source Inventory, the offline layer is MSI-aware and scopes reservations to the source assigned to that register. We confirm exact version and MSI support during scoping.

While online, a Service Worker keeps an IndexedDB snapshot of your catalog, prices, tax rules, and recent customers fresh in the background. If the connection drops, the register sells against that cached snapshot. You control a cache-staleness and price-lock window in system configuration so offline prices always stay within merchant-approved bounds, and the cache refreshes automatically the moment connectivity returns.

No — and we are deliberate about that. Offline resilience touches your payment capture, tax rules, and inventory reconciliation, which are too install-specific for a generic one-click package. ECOSIRE builds, installs, and supports it directly on your Magento instance, then hands over clean, documented code that you own. There is no public Marketplace download link for this module.