The verdict in three sentences
In 2026, integrating online payments for a UK/EU SME costs EUR 3,000-9,000 in development, plus fees of 1.4-2.9 % + EUR 0.25 per transaction. The real line item to watch is not integration but recurring fees, chargebacks/disputes and the checkout failure rate. A clean project ships in 3-6 weeks, 3D Secure and PCI-DSS compliance included.
What integration really costs in 2026
Cost depends on the PSP, volume and how customised the checkout is. Here are 2026 orders of magnitude for an SME processing EUR 20,000-150,000 per month.
| PSP | Card fee EU | Fixed fee/transaction | Integration (dev) | Payout |
|---|---|---|---|---|
| Stripe | 1.5 % | EUR 0.25 | EUR 3,000-7,000 | T+7 then T+2 |
| Adyen | 1.4 % + interchange | EUR 0.11 | EUR 6,000-12,000 | T+1 to T+3 |
| Mollie | 1.8 % | EUR 0.25 | EUR 2,500-6,000 | T+1 |
| PayPlug | 1.2-2.9 % | EUR 0.25 | EUR 2,000-5,000 | T+1 |
| Lyra/PayZen | Quote | EUR 0.10-0.25 | EUR 4,000-9,000 | Per bank |
Often-forgotten items add up: wallets (Apple Pay/Google Pay), buy-now-pay-later (1.5-4 % commission), and automated reconciliation.
Chargebacks, disputes and failures: the hidden costs
Margin is decided after payment. A chargeback carries fixed fees on top of the refund, and a high failure rate leaks revenue.
| Item | 2026 order of magnitude | Impact |
|---|---|---|
| Chargeback fee | EUR 15-25/dispute | Direct margin |
| Dispute rate to watch | < 0.65 % | Beyond: network penalties |
| 3D Secure failure rate | 5-12 % | Revenue lost at checkout |
| Average e-commerce fraud | 0.3-1.2 % of revenue | Net losses |
| PCI-DSS SAQ-A compliance | EUR 0-1,500/year | Mandatory |
A well-built flow (3D Secure v2 "frictionless", tokenisation, smart retry) typically recovers 3-8 points of payment conversion.
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Mini case study
Claire, CFO of a furniture SME, processes EUR 90,000/month online. Moving from an ageing module to an optimised Stripe integration (project cost EUR 6,500), her checkout failure rate drops from 11 % to 4 %. Gain: about EUR 6,300 of recovered revenue per month, i.e. payback in under 5 weeks, before dispute savings.
FAQ
Do I need to be PCI-DSS certified myself? No. If you use a PSP-hosted field (Stripe Elements, etc.), you fall under the lightest SAQ-A questionnaire. The PSP carries most of the compliance burden.
What is a realistic minimum budget in 2026? For a standard SME, EUR 3,000-5,000 covers integration with a modern PSP. Above EUR 9,000 you are into multi-PSP orchestration or specific B2B needs.
How long to go live? Three to six weeks: 1 week scoping, 2-3 development, 1-2 testing (3D Secure, webhooks, reconciliation). Webhook testing is what most often blocks the launch.
Is instalment payment worth its cost? Yes for baskets above EUR 150: the 1.5-4 % commission is usually offset by a 20-40 % rise in average order value.
Can I switch PSP later? Yes, but plan for card-token portability: a poorly prepared migration forces customers to re-enter cards and hurts subscription retention.
Let's scope your project. Tell us your monthly volume, target payment methods (card, wallets, instalments) and your CMS: we will price the integration and recurring fees. 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.
