Bonaventure OgetoBy Bonaventure Ogeto|

Cost Modelling a Payment Integration Beyond Transaction Fees

Full cost components of a payment integration: 1) Transaction fee — 1.5% + NGN 100 per transaction (Paystack Nigeria). 2) Engineering time — initial integration (2-4 weeks), ongoing maintenance (4-8 hours/month). 3) Chargeback losses — typical 0.1-0.5% of volume; each dispute takes 2-3 hours of staff time. 4) Settlement lag cost — money locked in transit for T+1 to T+2 represents a working capital cost if you operate on thin margins. 5) Fraud losses — typically 0.1-0.3% for well-managed integrations. 6) Compliance — PCI SAQ completion, NDPA/DPA registration, VAT registration. Transaction fees are a small fraction of total payment cost at scale.

Cost Model Components

Cost ComponentEstimateNote
Transaction fee (Paystack Nigeria)1.5% + NGN 100, cap NGN 2,000On NGN 10M/month volume ≈ NGN 195,000
Initial integration engineering2-4 weeks senior developer timeAt NGN 250,000/month salary ≈ NGN 125,000-250,000 one-time
Ongoing maintenance4-8 hours/monthWebhook fixes, API updates, edge case handling
Chargeback losses0.1-0.5% of volumeIncludes lost product + refund + dispute fee if any
Fraud losses0.1-0.3% of volumeFraudulent transactions that clear before detection
Settlement lag capital costT+1 to T+2 lag × volume × opportunity cost rateAt NGN 10M/month, 2-day lag = NGN 667K locked; at 15% annual rate ≈ NGN 8,000/month
Compliance (NDPA, VAT)NGN 50,000-200,000/yearLegal fees for registration; accountant for VAT remittance
Payment failure rate3-8% of attemptsFailed transactions are not direct costs but represent lost revenue

At NGN 10M/month volume, total cost is roughly NGN 350,000-500,000/month (3.5-5%), compared to the 1.5% transaction fee alone. The gap is maintenance, losses, and capital costs.

Learn More

See total cost of ownership: gateway fees vs engineering time for the comparison framework across multiple gateways.

Sign up for the McTaba newsletter

Key Takeaways

  • Transaction fees are 30-40% of total payment cost at scale — the rest is engineering, maintenance, and losses.
  • Engineering time is the largest cost item for most early-stage businesses — it outweighs fee differences.
  • Chargeback losses and dispute staff time are real costs that do not appear in pricing tables.
  • Settlement lag creates a working capital gap — money you earned but have not yet received.
  • Model all costs before comparing gateways on price — a cheaper fee can have higher total cost.

Frequently Asked Questions

How do I reduce chargeback losses on Paystack?
Best practices: 1) Fraud screening before charging (velocity checks, BIN validation, email domain check). 2) Require OTP for new customers. 3) Match billing descriptor to your brand so customers recognize the charge. 4) Make refund policy visible and easy to execute — customers who cannot get a refund file chargebacks. 5) Keep evidence (delivery confirmation, access logs, customer emails) so you can win disputes when you file them.
What is the working capital impact of T+2 settlement?
If you process NGN 10M per day and settle T+2, you have NGN 20M permanently in transit at any given time. If you need that money to pay suppliers or cover costs, you either need NGN 20M in working capital or a credit facility to bridge the gap. For most early-stage businesses, this is manageable. For businesses operating on thin margins with significant supplier payment obligations, settlement timing directly affects financial health.
Can I negotiate lower fees with Paystack at higher volume?
Yes — Paystack offers enterprise pricing for high-volume merchants. The threshold is typically NGN 50M-100M/month or above, depending on the relationship. Contact Paystack's enterprise team with your transaction volume data. Volume discounts are not automatically applied — you need to initiate the conversation. The savings at enterprise volumes can be meaningful: even 0.2% reduction on NGN 100M/month is NGN 200,000/month saved.

Ready to build real-world apps?

Join the McTaba Labs full-stack marathon (4 months full-time · 6 months part-time). Learn M-Pesa, USSD, and WhatsApp engineering while shipping 8 production apps.

Apply to the McTaba Marathon