The verdict in three sentences
Adding online payment for a B2B SME in London costs EUR 4,000 to 15,000 in 2026, live in 3 to 6 weeks. Fees vary enormously by method: cards at 1.4-2.9% + EUR 0.25, SEPA/BACS direct debit at 0.35-1% capped, bank transfer near zero. On high B2B baskets, steering clients toward transfer and direct debit cuts the bill sharply and shortens DSO by 5 to 15 days.
What integration costs in 2026
The setup cost depends on how many payment methods you support, the level of accounting automation, and B2B specifics (multi-account, approval thresholds, bank reconciliation).
| Integration scope | Cost 2026 (EUR) | Timeline | Included |
|---|---|---|---|
| Cards only (Stripe) | 4,000 - 7,000 | 3 weeks | Checkout, webhooks, receipt |
| Cards + direct debit (GoCardless) | 7,000 - 11,000 | 4 weeks | Mandates, schedules |
| Cards + debit + reconciled transfer | 10,000 - 15,000 | 5-6 weeks | Auto reconciliation, dunning |
| Multi-account + accounting export | 12,000 - 18,000 | 6 weeks | Xero/Sage, VAT, exports |
| Annual maintenance | 1,500 - 3,500 / yr | - | API updates, monitoring |
Budget a recurring EUR 1,500 to 3,500/year for maintaining API connections (Stripe and GoCardless release new versions several times a year).
Comparing fees by payment method
In B2B, the choice of method matters more than the integration cost, because baskets are large. On a EUR 4,000 invoice, 2% in fees = EUR 80; a bank transfer costs almost zero.
| Method | Fees 2026 | Settlement | Best for |
|---|---|---|---|
| Card (Visa/MC) | 1.4-2.9% + EUR 0.25 | D+1 to D+2 | Small baskets, first order |
| Direct debit (SEPA/BACS) | 0.35-1% (cap ~EUR 2) | D+2 to D+3 | Subscriptions, recurring |
| Bank transfer | EUR 0-0.50 fixed | D to D+1 | Large B2B baskets |
| Instant transfer | EUR 0.50-1 | Real time | Urgent, stock release |
| Amex card | 2.5-3.5% | D+2 | Large intl accounts |
Simple rule: above EUR 1,500-2,000 basket, steer toward transfer or direct debit; below that, cards stay the smoothest for conversion.
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Mini case study
Claire, CFO of an industrial SME in London (120 invoices/month, average basket EUR 3,200), collected everything by manual transfer with a 52-day DSO. She integrates cards + direct debit + reconciled transfer for EUR 11,000. Result: 30% of clients switch to automatic direct debit, DSO drops to 39 days (-13 days). On monthly revenue of EUR 384,000, those 13 days of freed cash represent about EUR 166,000 less working capital, for card/debit fees of barely EUR 900/month. Payback on the integration: under 2 months.
FAQ
Should I pick Stripe or GoCardless? They are complementary: Stripe excels at cards and international, GoCardless at low-cost recurring direct debit. Many B2B SMEs use Stripe for cards and GoCardless for schedules.
How long to go live? Plan 3 to 6 weeks depending on the number of methods and accounting integration. A card-only checkout can ship in 3 weeks.
Does online payment really lighten accounting? Yes, if you wire up automatic reconciliation: payments match to invoices and export to Xero or Sage, removing manual entry and hand-run dunning.
What is the DSO impact? By automating collection and reminders, you typically gain 5 to 15 days of DSO, a direct cash-flow improvement without raising financing.
Are card fees negotiable? Yes, above a certain volume (often EUR 50,000/month) card rates are negotiable. Transfers still remain the cheapest method for large baskets.
Let's scope your project. Tell us your target methods (card, direct debit, transfer), monthly volume and accounting tool, and we'll price the integration and reconciliation automation. 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.
