The verdict in three sentences
Adding online payment to your site costs 3,000 to 12,000 EUR in 2026, on top of transaction fees of 1.4 to 2.9% plus a fixed part depending on the provider and your payment mix. The right choice hinges on three axes: real fees, delegated PCI-DSS compliance and accounting reconciliation. The most tangible gain: immediate collection, which cuts unpaid invoices by up to 50% versus deferred payment.
Gateway comparison 2026
Headline fees often hide a fixed part per transaction and surcharges (non-EU cards, disputes). 2026 order-of-magnitude figures for an SME.
| Provider | EU card fee | Fixed part | Strengths |
|---|---|---|---|
| Stripe | 1.5% | 0.25 EUR | Fast integration, rich API |
| Adyen | 1.4% + interchange | 0.11 EUR | High volumes, multi-country |
| PayPal | 2.9% | 0.35 EUR | Recognition, express checkout |
| Bank transfer / SEPA | ~0.1-0.3% | 0 - 0.20 EUR | B2B, large amounts |
| Local solutions | 1.5 - 3% | variable | Proximity payment methods |
Rule: under 20,000 EUR/month of volume, Stripe/PayPal win on simplicity; above that, Adyen and SEPA cut the bill.
Integration cost and hidden items
The gateway is one thing; a clean integration is another. 2026 breakdown.
| Item | Scope | 2026 budget (EUR excl. tax) |
|---|---|---|
| Checkout + funnel integration | 1 to 2 payment methods | 3,000 - 6,000 |
| Refunds & dispute handling | Back office, statuses | 1,500 - 4,000 |
| Accounting reconciliation | Export, matching | 1,500 - 4,500 |
| Webhooks & hardening | Reliable confirmations | 1,000 - 3,000 |
| PCI-DSS compliance (via provider) | SAQ-A, no card storage | included - 1,500 |
| Total | Full integration | 3,000 - 12,000 |
By delegating PCI-DSS to the provider (no card data on your servers), you stay at SAQ-A, the lightest level.
Mini case study
Karim, manager of an equipment trading SME in Marseille, bills 180,000 EUR/month with 40% on deferred payment and ~3.5% unpaid, i.e. ~2,520 EUR/month lost or in recovery. By moving 70% of those customers to immediate collection via a gateway (8,500 EUR integration, ~1.7% fees), unpaid invoices fall to ~1.6% on that scope: ~1,300 EUR/month saved. Integration pays back in ~7 months, before even counting the cash-flow gain from faster collection.
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FAQ
What are the real gateway fees in 2026?
Budget 1.4 to 2.9% plus a fixed part (0.11 to 0.35 EUR) per transaction. The rate depends on the provider, the card's country and your volume. Negotiate from 20,000 EUR/month.
How much does the technical integration cost?
3,000 to 12,000 EUR depending on the number of payment methods, refund/dispute handling and accounting reconciliation. A simple single-provider checkout stays around 3,000-6,000 EUR.
Are we liable for PCI-DSS compliance?
If you delegate collection to the provider (no card data stored with you), you stay at SAQ-A, the lightest level. Never store card numbers in plain text.
How do we make payment confirmation reliable?
With provider-signed webhooks, server-side verification and idempotent statuses. It's a 1,000-3,000 EUR item that prevents paid-but-unrecorded orders.
Does online payment really cut unpaid invoices?
Yes: immediate collection removes the deferred-payment risk. On migrated scopes, up to 50% fewer unpaid invoices is common, with an immediate cash-flow effect.
Let's scope your project. Tell us your monthly volume, target payment methods and accounting tool, and we'll recommend the best real-cost gateway and quote the integration. 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.
