The verdict in three sentences
An ERP integration for a B2B e-commerce platform costs between EUR 12,000 and 40,000 depending on the number of flows and the sync mode. The real trade-off is batch vs real-time: batch (a few syncs/day) is cheaper but exposes you to stockouts and oversell, real-time secures stock at the price of a more demanding architecture. Done well, it removes double entry and slashes stock errors.
The flows to sync and their cost
A B2B integration means several distinct flows, each with its own criticality and cost. Ballpark 2026 figures, EUR. Overall timeline 6-12 weeks.
| Flow | Direction | Criticality | Cost |
|---|---|---|---|
| Available stock | ERP to web | High | EUR 3,000-8,000 |
| Per-customer pricing | ERP to web | High | EUR 3,000-9,000 |
| Product sheets / catalogue | ERP to web | Medium | EUR 2,000-6,000 |
| Order push-back | Web to ERP | High | EUR 3,000-8,000 |
| Order / delivery status | ERP to web | Medium | EUR 2,000-5,000 |
| Credit and customer accounts | ERP to web | High | EUR 2,000-6,000 |
| Full integration | Bidirectional | EUR 12,000-40,000 |
The priority pair is stock + order push-back: without it, the order desk re-enters everything and the site sells what no longer exists.
Batch vs real-time
The sync mode determines cost, data freshness and oversell risk. Here's the 2026 trade-off.
| Criterion | Batch (2-6 syncs/day) | Real-time (event/API) |
|---|---|---|
| Integration cost | EUR 12,000-22,000 | EUR 25,000-40,000 |
| Stock freshness | A few hours' lag | Near instant |
| Oversell risk | Real on fast rotation | Low |
| Load on ERP | Moderate | Must be sized |
| Technical complexity | Low | High (queues, webhooks) |
| Ideal use case | Stable stock, safety margins | Tight stock, critical SKUs |
Many SMEs start on batch for the catalogue and move stock to real-time only on sensitive SKUs: it's the best cost/risk ratio.
Need a professional website?
Kolonell builds websites that attract clients, optimized for the Sénégalese market. Free quote in 2 minutes.
Mini case study
Orla, e-commerce lead at a components distributor in Dublin, suffers 4% of orders in oversell for lack of up-to-date stock, i.e. ~150 orders/month to fix. Each fix costs 20 minutes of order-desk time plus customer risk, so 50 hours/month. A real-time integration on critical SKUs at EUR 32,000 brings oversell under 0.5%. Estimated order-desk and dispute saving EUR 14,000/year, plus customer retention; payback in ~24 months before the reputation gain.
FAQ
Batch or real-time: how to choose? If your stock turns fast or your SKUs are critical, real-time is required. Otherwise a batch of 2-6 syncs/day is enough and costs far less (EUR 12,000-22,000).
Which flows to prioritise first? Available stock and order push-back: they remove double entry and oversell. Per-customer pricing comes right after for B2B.
How long to integrate an ERP? Expect 6-12 weeks depending on the number of flows and the ERP's API availability. Older ERPs without APIs lengthen the timeline.
Can we mix batch and real-time? Yes, it's even recommended: catalogue and pricing in batch, sensitive-SKU stock in real time. You optimise the cost/risk ratio.
What happens if the ERP goes down? You plan a queue and automatic recovery: web orders are buffered and replayed once the ERP returns, with no loss.
Let's scope your project. Tell us your ERP, your critical flows and your stock rotation and we'll price a batch or real-time integration to fit. 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.
