The verdict in three sentences
For a franchisor with 45 locations running 3 different POS systems, a custom integration middleware costs EUR 25,000 to 60,000 excl. tax (about USD 27,000 to 65,000) and goes live in roughly 3 months. It pushes sales, inventory and revenue into the ERP nightly or near real time, with monitoring and alerts, for EUR 150 to 400 per month in hosting. Against an iPaaS billed at EUR 500 to 2,500 per month, custom pays off between year 2 and year 4, and above all it brings the month-end close from day 12 down to day 3.
Why three POS systems complicate everything
In a franchise network, legacy locations often keep their original POS software. Each vendor exposes data differently: a modern REST API, a scheduled CSV export, or a local database to query. Finance then spends month-end consolidating files, fixing mismatched SKUs and chasing late franchisees.
A middleware acts as the single translator: it reads each source in its own format, normalises the data (SKUs, sales tax, payment methods, discounts), checks consistency and pushes it into the ERP. Gaps surface as alerts instead of discoveries on day 10.
2026 budget for a custom middleware
| Component | Scope | 2026 budget (excl. tax) |
|---|---|---|
| Scoping and flow mapping | Workshops, data dictionary, mapping rules | EUR 3,000 - 6,000 |
| POS connector 1 (REST API) | Sales, receipts, payments | EUR 4,000 - 8,000 |
| POS connector 2 (CSV/SFTP exports) | Scheduled collection, error recovery | EUR 4,000 - 9,000 |
| POS connector 3 (local database or legacy API) | Lightweight in-store agent, queue | EUR 5,000 - 12,000 |
| ERP connector | Sales entries, inventory, revenue | EUR 4,000 - 12,000 |
| Monitoring, alerts and dashboard | Failed flows, silent stores, revenue gaps | EUR 3,000 - 8,000 |
| Testing, history load and rollout | 12 months of history, 5-store pilot | EUR 2,000 - 5,000 |
| Project total | EUR 25,000 - 60,000 | |
| Hosting and supervision | Cloud, backups, logs | EUR 150 - 400 / month |
The low end assumes two POS systems with decent APIs and a recent ERP. The high end covers a legacy POS without an API and an ERP with strict import formats. These are 2026 estimates: exact pricing depends on vendor documentation.
Custom build or iPaaS?
| Criterion | Custom middleware | iPaaS (Make, Boomi, etc.) |
|---|---|---|
| Upfront investment | EUR 25,000 - 60,000 | EUR 8,000 - 25,000 of configuration |
| Recurring cost | EUR 150 - 400 / month + optional support | EUR 500 - 2,500 / month in licences |
| 5-year cumulative cost (mid-range) | EUR 42,500 + 16,500 = 59,000 + support | EUR 16,500 + 90,000 = 106,500 |
| Connector for a POS without an API | Built specifically | Often impossible or patched together |
| Volume (45 stores, ~6,000 receipts/day) | No volume surcharge | Operations billed, tiers to watch |
| Code ownership and exit | Full | Vendor dependency |
| Time to go live | 3 months | 1 - 2 months |
An iPaaS still makes sense if all your POS systems have native connectors and volume stays modest. With a legacy POS and thousands of receipts per day, per-operation billing and workarounds end up costing more than development.
Mini case study
Nadia, CFO of a quick-service restaurant franchisor in Miami (45 locations, EUR 38M network revenue), consolidates sales by hand every month with two financial controllers. The close lands on day 12. The middleware is quoted at EUR 46,000, plus EUR 280 per month in hosting. After go-live, the close moves to day 3 and manual consolidation drops from 70 to 12 hours per month: 58 hours saved at EUR 45 loaded cost, or EUR 2,610 per month and EUR 31,300 per year. Net of hosting (EUR 2,330 per month), payback in about 20 months, before counting franchise royalty gaps detected earlier.
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FAQ
How much does it cost to integrate several POS systems with an ERP?
In 2026, allow EUR 25,000 to 60,000 excl. tax for 3 POS systems and one ERP, depending on API quality. Hosting adds EUR 150 to 400 per month.
How long does go-live take?
About 3 months: 3 weeks of scoping, 6 to 7 weeks of connector development, then a 2 to 3 week pilot on 5 stores before network rollout.
What happens if a store loses its connection?
Data is queued locally and resent when the network returns. An alert flags any store with no data for more than 2 hours, for example.
Should we replace franchisees' POS instead of integrating?
Replacing 45 POS systems often costs EUR 1,500 to 4,000 per location, or EUR 70,000 to 180,000, plus training. Integration is usually 2 to 4 times cheaper.
What maintenance should we plan for?
POS vendors change their APIs 1 to 2 times a year. Plan a maintenance contract or a budget of a few days per year to adapt the connectors.
Let's scope your project. List your POS systems, your ERP and your receipt volume: we will price the middleware, its monitoring and a store-by-store rollout plan. Detailed quote within 48 h. WhatsApp +221 77 596 93 33.
Mohamed Bah
Fondateur, Kolonell
Passionate about digital and entrepreneurship in Africa, Mohamed has been helping Sénégalese businesses with their digital transformation since 2020. Founder of Kolonell, he believes every SME deserves a professional and accessible online présence.
