The verdict in three sentences
A serious online payment integration for a European SME costs between 6,000 and 15,000 EUR in 2026, depending on how many flows you enable (one-off payments, subscriptions, pay-by-link invoices). The real cost is not the card fee (1.4% + 0.25 EUR on European cards) but the hidden fees: chargebacks, currency conversion, 3DS/SCA handling and accounting reconciliation. Scoped properly, the project pays for itself by killing manual follow-ups and accelerating collection by several weeks.
What an integration actually covers
Cost depends on the bricks you turn on. A simple payment button has nothing in common with a reconciled recurring subscription system.
| Item | Scope | 2026 cost (EUR) |
|---|---|---|
| One-off payment integration | Checkout, 3DS/SCA, confirmation webhooks | 3,000 - 8,000 |
| Subscriptions / recurring | Plans, proration, failed-payment dunning | 3,000 - 6,000 |
| Pay-by-link on invoices | Link generation, status, reminders | 1,500 - 3,000 |
| Accounting reconciliation | Export to Sage/Pennylane, matching | 2,500 - 5,000 |
| PCI-DSS (SAQ-A) hardening | Config, tests, documentation | 1,000 - 2,500 |
| Maintenance (per year) | API monitoring, SCA updates, support | 1,800 - 4,800 |
An SME that just wants to collect one-off invoices stays around 4,000-6,000 EUR. A SaaS SME with subscriptions and reconciliation aims for 10,000-15,000 EUR.
Comparing providers and fees
Card fees vary little between players, but ancillary fees (currency, chargebacks, payouts) make the difference at volume.
| Provider | EU card fee | Key ancillary fees | Best fit |
|---|---|---|---|
| Stripe | 1.4% + 0.25 EUR | +2% currency conversion, 15 EUR / chargeback | SaaS, subscriptions, dev-friendly |
| Adyen | ~0.60% + interchange | Complex billing, volume minimum | High volume, retail |
| Mollie | 1.8% + 0.25 EUR | Simple, fewer advanced APIs | EU/Benelux e-commerce SMEs |
| PayPlug | 1.2% + 0.25 EUR | France SME/micro focus | French merchants |
| Lyra / Systempay | Bank quote | Tied to acquiring bank | Classic bank volumes |
Watch the hidden costs: a chargeback costs 15 EUR fixed on top of the refund; foreign-currency payments add ~2%; and poorly handled 3DS failures can lose 5-10% of transactions.
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Mini case study
Claire, CFO of a B2B services SME in Nantes, collects 120 invoices/month, average 850 EUR, i.e. 102,000 EUR/month. Before: manual transfers, 42-day DSO. She invests 9,500 EUR in a pay-by-link + reminder + Pennylane reconciliation integration. Result: DSO cut to 18 days, i.e. ~82,000 EUR of working capital freed permanently, and 12 hours/month of chasing saved (~450 EUR). Card fees on the 30% of flows paid online: ~430 EUR/month. The project pays back in under 4 months from cash flow and time saved alone.
FAQ
What does the card fee really cost in 2026? Expect 1.4% + 0.25 EUR on standard European cards. Non-EU, premium or commercial cards climb to 2.5-2.9%. On 100,000 EUR of volume, fees land around 1,400-1,800 EUR/month.
Is 3DS/SCA mandatory? Yes, strong customer authentication (SCA) is required by PSD2 for most EU online payments. A good integration handles low-value exemptions and fallbacks to limit the 5-10% failure rate.
Am I concerned by PCI-DSS? If you use a hosted checkout (Stripe Checkout, etc.), you fall under the simplified SAQ-A questionnaire: a few hours of config and documentation, not a heavy audit.
Can I handle subscriptions myself? Technically yes, but dunning (retrying failed payments) and proration make up 40% of a recurring project's cost. That is where revenue leaks hide.
How long to go live? A one-off payment: 2-3 weeks. A full subscriptions + reconciliation system: 6-10 weeks depending on your accounting team's availability.
Let's scope your project. Tell us your flows (one-off, subscription, invoice), your monthly volume and your accounting tool; we will size an integration at the right level, between 4,000 and 15,000 EUR. 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.
