Every retailer, restaurant and hospitality business eventually faces the same question: how should the point of sale (POS) talk to the ERP? The POS captures every sale at the counter. The ERP holds the products, stock, customers, finance and reporting. If the two are not connected, someone ends up re-keying data, reconciling spreadsheets and closing the month late.
There is no single right answer. In our integration projects we see three main approaches, each with a different balance of detail, effort and control. This guide explains all three so you can pick the one that fits your business.
Option 1: Detail integration
Detail integration is the full, two-way approach. Everything is synchronized at the most granular level.
ERP to POS (master data):
- Warehouses and stores
- Products, including units of measure (UoM)
- Inventory levels
- Customers
- Vendors
- Prices
POS to ERP (transactions):
- Sales
- Refunds and returns
- Payments
- Inventory transactions, such as receiving, transfers and adjustments
Best for: businesses where the ERP is the single source of truth, with multiple stores and warehouses, loyalty or customer accounts, and a need for item-level reporting and real inventory control.
Trade-offs: the most powerful option, but also the largest to build and maintain. It needs clean master data, careful mapping of every field, and monitoring for volume, since every single transaction flows into the ERP.
Option 2: Consolidated integration
Consolidated integration reduces the volume dramatically. Instead of sending every transaction, the POS sends a summary: one sales invoice per store (typically per day or per shift). Master data synchronization is optional. Some businesses keep their products and prices in the POS and only send the totals.
Best for: businesses with a high number of small transactions, such as F&B outlets, kiosks and convenience stores, where the ERP does not need to see every receipt, only the financial result per store.
Trade-offs: the ERP stays light and fast, and the integration is far simpler. The cost is detail. You lose customer-level and receipt-level visibility inside the ERP, and item-level analysis has to come from the POS reports instead.
Option 3: GL integration
GL integration is the most minimal approach. The POS does not send sales documents at all. It only generates journal entries and posts the values to the general ledger in the ERP.
For a sales transaction, the postings look like this:
| Posting | Debit | Credit |
|---|---|---|
| Cost of goods sold | COGS | Inventory |
| Sales revenue | Accounts Receivable | Revenue |
| Payment received | Tender (cash, card, e-wallet) | Accounts Receivable |
In other words, the sale recognizes revenue against Accounts Receivable and moves the cost out of inventory into COGS. When the customer pays, the receivable is cleared against the tender account that received the money.
Best for: businesses that run inventory, products and operations entirely in the POS system and only need the ERP for financial reporting, consolidation and compliance.
Trade-offs: the simplest and lightest option, and it keeps the ERP clean. The ERP, however, has no sales documents, stock records or customer data behind the numbers, so any operational question has to be answered in the POS.
Comparing the three options
| Detail | Consolidated | GL | |
|---|---|---|---|
| Master data sync | Full, ERP to POS | Optional | Not required |
| What goes to the ERP | Every transaction | One sales invoice per store | Journal entries only |
| Inventory control in ERP | Full | Limited | None (value only) |
| Data volume | High | Low | Lowest |
| Implementation effort | Highest | Medium | Lowest |
| Reporting detail in ERP | Receipt and item level | Store level | Account level |
How to choose
Ask these questions:
- Where is your source of truth for products, prices and stock? If it is the ERP, you will need detail integration.
- Does the ERP need to see individual receipts? For auditing, customer accounts or returns tracking, yes. For store-level financial results, no.
- How many transactions do you process? Thousands of small sales per store per day are often better consolidated.
- Who uses the ERP? If it is only the finance team, GL or consolidated integration may be all you need.
- How much can you invest now? Many businesses start simple and move to a more detailed model as they grow.
The options are not permanent choices. A common path is to begin with GL or consolidated integration to close the books faster, then add master data and detail synchronization once the operation demands it.
Make it reliable, whichever you choose
- Agree on the master data owner for each entity, so products and prices are not edited in two places.
- Make sure each document is sent once. Use unique references so a retry never creates a duplicate invoice or journal.
- Handle failures visibly. Log every message, alert on errors, and allow safe re-sending.
- Reconcile regularly. Compare POS totals with ERP totals per store and per day.
- Plan for offline stores. POS servers often sit on a local network with no public API, so the connection method matters.
How AllSync helps
AllSync supports all three models. An offline connector installed on the store or head-office server reads data from the local POS database or local API and sends it to AllSync. From there, you can map and transform it and deliver it to your ERP as master data updates, detailed transactions, consolidated sales invoices or GL journal entries. Because the logic is configurable, you can start with one model and change it later without rebuilding the whole integration.
Conclusion
Detail integration gives you maximum control, consolidated integration gives you balance, and GL integration gives you simplicity. The right choice depends on where your data lives, how much detail your ERP really needs, and how much you want to invest.
Not sure which model fits your business? Talk to us, and we will help you choose and build it with AllSync.