The verdict in three sentences
For a B2B SME in Miami, integrating a PSP (Stripe, Adyen, Mollie) into an ordering portal runs 4,000-12,000 EUR (~4,300-13,000 USD) as a project, plus transaction fees of 1.4% + 0.25 EUR per European card and near-free bank transfers. Budget a maintenance retainer of 400-900 EUR/month for webhooks and security updates. The real challenge is not the PSP price but PCI-DSS SAQ-A compliance, reconciliation with your ERP and a controlled 4-8 week timeline.
B2B payment methods: what to wire in
In B2B, cards alone are not enough: clients often pay by wire, at order, or on terms. Here are the methods to plan and their 2026 cost (order of magnitude).
| Payment method | 2026 fee (estimate) | Settlement | Typical B2B use |
|---|---|---|---|
| EU card (Stripe) | 1.4% + 0.25 EUR | Instant (T+2 payout) | Orders < 5,000 EUR |
| Non-EU / commercial card | 2.9% + 0.25 EUR | Instant | International clients |
| Bank transfer at order | 0.20-0.50 EUR or free | T+0 to T+1 | Large baskets |
| Direct debit (mandate) | 0.25-0.35 EUR | T+2 to T+5 | Subscriptions, recurring |
| Net 30-60 terms | Credit insurance 0.3-1% | On due date | Open accounts |
| Wallet (Apple/Google Pay) | 1.4% + 0.25 EUR | Instant | Mobile, quick checkout |
The winning B2B combo: cards for small amounts + transfer/direct debit for large baskets, which mechanically cuts your PSP bill.
Integration budget and contract security
The project breaks down into technical integration, compliance and operations. Contract security clauses matter as much as the code.
| Item | 2026 range (EUR) | What it covers |
|---|---|---|
| PSP integration (API, checkout, webhooks) | 4,000 - 12,000 | Checkout, statuses, retry on failure |
| PCI-DSS SAQ-A compliance | 800 - 2,500 | PSP-hosted fields, annual questionnaire |
| 3-D Secure / SCA | included - 1,500 | Strong customer authentication |
| ERP reconciliation (basic) | 2,000 - 6,000 | Invoice/payment matching |
| Monthly maintenance | 400 - 900 /month | Fixes, PSP version upgrades |
| One-off security audit | 1,500 - 4,000 | Pentest, flow review |
In the contract, demand three clauses: shared PCI responsibility (the PSP hosts card data, the agency never stores it), reversibility (recovery of tokens and history), and a webhook SLA (redelivery on outage so no payment notification is lost).
Mini case study
Sarah, CFO of an industrial SME in Miami (18 staff, 3.7M USD revenue), is digitizing supplier orders. Volume: 320 transactions/month, average basket 1,900 EUR, 60% wire and 40% card. Monthly PSP cost: 128 cards x (1.4% x 1,900 + 0.25) ~= 3,430 EUR, plus 192 wires at 0.30 EUR ~= 58 EUR, i.e. ~3,490 EUR/month in fees. One-shot integration: 8,500 EUR + 650 EUR/month retainer. By shifting an extra 15% of cards to wire, she saves ~500 EUR/month, i.e. 6,000 EUR/year — the integration pays back in 18 months on avoided fees alone.
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FAQ
What does B2B payment integration really cost in 2026?
Between 4,000 and 12,000 EUR depending on the number of payment methods, the ERP to connect and the reconciliation level. Add 400-900 EUR/month of maintenance.
Do I need to be PCI-DSS certified myself?
Usually no: with card fields hosted by the PSP (SAQ-A), you never store card data and file a simplified annual questionnaire. The agency configures everything to stay in SAQ-A.
Is a bank transfer cheaper than a card?
Yes, clearly: 0.20-0.50 EUR per transfer versus 1.4% + 0.25 EUR per card. On a 1,900 EUR basket that is ~27 EUR difference per transaction.
How long to go live?
Plan 4-8 weeks: 1-2 weeks of scoping, 2-4 of development and testing, 1-2 of UAT and compliance before production.
What happens if a payment webhook fails?
A serious PSP replays the webhook several times; on the agency side we add a retry queue and backup reconciliation so an order is never wrongly flagged unpaid.
Let's scope your project. Tell us your monthly volume, target payment methods (card, transfer, terms) and ERP: we price the PSP integration and retainer. 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.
