Service
Payment & Fintech Integrations
Overview
Payment integrations are judged almost entirely by what happens when something goes wrong — a callback that never arrives, a duplicate charge, a payout that leaves no trace of which order it belonged to. Those are the cases most integrations are never tested against.
We build for the failure path first: idempotent requests, verified callbacks, and a reconciliation process so every transaction has a known final state, whichever way it went wrong.
Capabilities
What payment & fintech integrations covers
Payment gateway integration
Card, mobile money and bank transfer flows integrated end to end, with idempotent requests so a retried call cannot double-charge anyone.
Collections and disbursements
Inbound collection and outbound payout flows built around verified callbacks rather than assumed success.
Reconciliation
A reconciliation path that matches every transaction against its source of truth, so a failure surfaces as a report rather than a support ticket.
Compliance-aware handling
Card data and payment credentials handled to keep your compliance scope as small as it can honestly be.
Process
How we deliver it
The four stages payment & fintech integrations moves through, and what you have at the end of each.
Map the money
Every state a transaction can be in, including the failure and retry states, agreed before any integration work starts.
Design for failure first
Idempotency, callback verification and retry behaviour designed before the happy path, because the happy path was never the hard part.
Build and test the edge cases
Timeouts, duplicate callbacks and partial failures exercised deliberately, not left for the first real customer to find.
Prove it reconciles
Reconciliation run against real transaction data before go-live, then documentation and handover to your team.
Copy pending founder sign-off
PRD §8 requires the exact scope of each service to be confirmed before final copy. Outstanding for this one:
- Which payment providers and rails are supported as standard — card processors, mobile money, bank transfer — and in which markets
- Whether any regulatory or PCI DSS scope commitments can be stated publicly for payment work
- Standard support terms for payment integrations after handover, given settlement issues are time-sensitive
Related work
Case studies
No published case studies yet
We publish case studies only once the client has approved the wording, and none are cleared for publication yet. Ask us directly and we'll talk you through comparable work under NDA.
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