Quick facts
- Price
- $499.00 USD
- dynamics_365_business_central versions
- —
- Setup time
- 20 min
- License
- One-time perpetual
- Languages
- 11 languages
One-time Purchase
Offline-First POS Sync Engine
A build-to-order Business Central AL extension that lets your point of sale keep selling through internet outages by caching transactions locally, then idempotently replaying and reconciling them to BC the moment connectivity returns.
$499.00USD
No payment now. This sends a quote request to our team — we'll follow up by email with pricing and next steps.
Key Features
Local transaction cache per register so checkout continues fully offline with zero blocked sales during an internet or VPN outage
Offline price, promotion and on-hand inventory snapshot synced down from Business Central, refreshed automatically whenever the register is online
Automatic conflict-free replay and reconciliation to BC the moment connectivity returns, draining the queue oldest-first
Idempotent posting to Business Central via a client-generated unique transaction key enforced by an AL event subscriber on the sales posting routine — no duplicate sales entries on retries
Per-device sync-status dashboard delivered as a BC page extension showing queued, synced, failed and stuck counts per register
Stuck-transaction alerts with configurable thresholds, optionally surfaced through Dataverse / Power Automate notifications
Job Queue entry that drains the offline replay queue on a schedule with retry/backoff, so reconciliation needs no manual button-press
Sync ledger (table extension) recording every replay attempt, timestamp, source device and resulting BC document number for full audit trace
Dedicated permission sets separating cashier, store-manager and sync-administrator access to offline and reconciliation functions
REST/OData v4 integration to BC with token refresh handling and graceful degradation when only partial connectivity is available
Configurable offline cap (max queued value or transaction count per device) to bound risk while the link is down
Conflict surfacing for inventory or price drift detected at replay time, flagged for store-manager review rather than silently overwritten
About this Product
Sell through the outage, reconcile when you're back
Why Choose Offline-First POS Sync Engine
Local transaction cache per register so checkout continues fully offline with zero blocked sales during an internet or VPN outage
Offline price, promotion and on-hand inventory snapshot synced down from Business Central, refreshed automatically whenever the register is online
Automatic conflict-free replay and reconciliation to BC the moment connectivity returns, draining the queue oldest-first
Idempotent posting to Business Central via a client-generated unique transaction key enforced by an AL event subscriber on the sales posting routine — no duplicate sales entries on retries
Per-device sync-status dashboard delivered as a BC page extension showing queued, synced, failed and stuck counts per register
Stuck-transaction alerts with configurable thresholds, optionally surfaced through Dataverse / Power Automate notifications
Most Business Central POS integrations assume a live connection. When the link drops, the register either freezes or — worse — staff fall back to paper and you reconcile by hand later. The Offline-First POS Sync Engine removes that failure mode. It is a build-to-order per-tenant AL extension that ECOSIRE designs, builds, installs and supports directly on your Business Central environment (online or on-prem) — not an instant AppSource download.
How it works
Each register holds a local transaction cache plus a point-in-time snapshot of item prices, active promotions and on-hand inventory pulled from BC. Checkout continues fully offline against that snapshot. The moment connectivity returns, a queued sync worker replays every offline transaction into Business Central through the BC REST/OData v4 API and posts the resulting sales documents.
Posting is idempotent: each offline transaction carries a client-generated unique key, and an AL event subscriber on the sales posting routine rejects any replay that has already landed — so a flaky connection that retries three times still produces exactly one sales entry, never duplicates.
Built into Business Central properly
We deliver real BC objects, not a bolt-on: table extensions for the offline queue and sync ledger, page extensions surfacing a per-device sync-status dashboard, a Job Queue entry that drains the replay queue on a schedule, dedicated permission sets, and event subscribers for conflict-free reconciliation. Optional Dataverse / Power Platform wiring lets you alert on stuck transactions from Power Automate.
ECOSIRE handles the AL development, the per-tenant install, UAT against your live catalog, and ongoing support and BC version-update compatibility. You get the source-aligned extension running in your own tenant — honestly scoped, honestly delivered.
What you get
- A per-tenant Business Central AL extension (.app) built to your catalog, register topology and posting setup, installed in your environment
- Table extensions for the offline queue and sync ledger, plus page extensions for the per-device sync-status dashboard
- Event subscribers implementing idempotent sales posting and conflict-safe reconciliation
- A configured Job Queue entry for scheduled, retry-aware replay of the offline queue
- Permission sets for cashier, store-manager and sync-administrator roles, assigned during install
- Optional Dataverse / Power Automate flow for stuck-transaction alerting, configured to your notification channel
- UAT against your live price, promotion and inventory data, with a documented sign-off checklist
- Admin runbook plus knowledge transfer covering monitoring, reprocessing stuck transactions and handling flagged conflicts
Who this is for
Multi-store retail operations manager
Runs several branches on Business Central where at least one site has unreliable broadband. Needs every till to keep selling during outages and to trust that the day's sales reconcile into BC exactly once, with a clear dashboard showing which registers are behind.
Pop-up and market vendor
Sells at fairs, markets and temporary locations where Wi-Fi and mobile signal are intermittent or absent for hours. Wants checkout that never stops, working off a local price and promo snapshot, then auto-syncs to BC the instant a connection appears.
Franchise IT / BC administrator
Owns the Business Central tenant across franchised stores and is accountable for clean financials. Needs idempotent posting, per-device permission control, an auditable sync ledger and stuck-transaction alerts rather than late-night manual reconciliation.
Installation overview
Download from ECOSIRE
Buy the license on ecosire.com and download the Offline-First POS Sync Engine module ZIP from your account dashboard.
Upload to Odoo
Extract the ZIP into your Odoo custom addons folder on the server (or upload via Apps > Install from file on Odoo.sh / runbot).
Install the module
Activate Developer Mode, open Apps, click Update Apps List, search for Offline-First POS Sync Engine, and press Install.
Configure settings
Open the new menu, paste your ECOSIRE license key, connect any external credentials (Shopify, Amazon, Stripe, etc.), and save.
Verify & go live
Run the built-in connection test, sync your first 10 records, and schedule the recurring cron. Contact support if anything fails.
How Offline-First POS Sync Engine Compares
| Criterion | ECOSIRE | Custom Build | Competitor | Odoo Native |
|---|---|---|---|---|
| Continues selling fully offline during an internet outage | ||||
| Idempotent posting that prevents duplicate sales on retry | ||||
| Per-device sync-status dashboard and stuck-transaction alerts | ||||
| Built as native BC objects (AL extensions, event subscribers, Job Queue, permission sets) | ||||
| Tailored to your exact catalog, register topology and conflict rules | ||||
| Installed and supported on your tenant with BC version-update compatibility | ||||
| Auditable sync ledger linking each offline sale to its BC document | ||||
| No in-house AL development team required to build or maintain it |
Frequently Asked Questions about Offline-First POS Sync Engine
+How long does delivery take, and what is the process?
This is a build-to-order extension, not an instant download. After a short scoping call we confirm your register topology, catalog size and BC version, then build and install the per-tenant AL extension. Typical delivery is two to four weeks depending on how many register configurations and conflict rules you need. The flow is: scope and fixed quote, build, install into a sandbox, UAT against your live price/promo/inventory data, then promotion to production with sign-off.
+How is ongoing support and Business Central compatibility handled?
Because we install the extension in your own tenant, ECOSIRE provides post-launch support and keeps it compatible across Business Central updates. Microsoft ships major BC releases twice a year; we test the extension against each relevant update and ship any required AL fixes under your support agreement. Support covers reprocessing stuck transactions, tuning the Job Queue cadence and offline caps, and adjusting conflict rules as your catalog evolves. Support terms and response times are agreed in writing before go-live.
+Will offline replays ever create duplicate sales in Business Central?
No. Every offline transaction carries a client-generated unique key. An AL event subscriber on the sales posting routine checks that key against the sync ledger before posting, so a transaction that the connection retries multiple times still produces exactly one BC sales entry. Failed or partial replays are flagged in the dashboard for review, never silently re-posted.
+What happens to inventory and pricing if they changed in BC while a register was offline?
Each register sells against a snapshot captured when it was last online. At replay time the engine detects drift — for example a price change or an item that went out of stock centrally — and flags those transactions for store-manager review rather than overwriting silently. You decide the conflict policy during scoping (accept-as-sold, adjust, or hold), and we encode it into the reconciliation event subscribers.
+Does this run on Business Central online (SaaS) or on-premises?
Both. The extension is delivered as a per-tenant AL extension that installs into a BC SaaS environment or an on-premises deployment. It integrates through the standard BC REST/OData v4 API and standard BC objects (table/page extensions, event subscribers, Job Queue, permission sets), so it lives inside your environment under your governance rather than depending on external middleware.
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Offline-First POS Sync Engine
A build-to-order Business Central AL extension that lets your point of sale keep selling through internet outages by caching transactions locally, then idempotently replaying and reconciling them to BC the moment connectivity returns.
- Local transaction cache per register so checkout continues fully offline with zero blocked sales during an internet or VPN outage
- Offline price, promotion and on-hand inventory snapshot synced down from Business Central, refreshed automatically whenever the register is online
- Automatic conflict-free replay and reconciliation to BC the moment connectivity returns, draining the queue oldest-first
- Idempotent posting to Business Central via a client-generated unique transaction key enforced by an AL event subscriber on the sales posting routine — no duplicate sales entries on retries