Fintech Software Development: PCI-DSS, KYC, Payment Integrations Done Right

Apex IT Solutions builds fintech infrastructure for B2B and consumer financial products: payment integrations, PCI-DSS compliant checkout, KYC/AML pipelines, neobank apps, lending platforms, B2B invoicing, and treasury dashboards. We ship to clients across the US, UK, UAE, KSA, and Pakistan, and we know the compliance frameworks in each region. Fintech engineering doesn't tolerate sloppy execution — every transaction has audit, every error has a customer impact, every breach is regulatory. That's the bar we hold ourselves to.

Fintech areas we engineer for

• Payment integrations: Stripe, Adyen, Razorpay, Easypaisa, JazzCash, Mashreq, NEFT, SWIFT, Plaid
• Neobank and wallet apps: KYC onboarding, mobile transfers, card issuance integrations
• Lending platforms: origination, credit scoring integrations, loan servicing, collections
• B2B invoicing and net-terms: recurring billing, dunning, AR/AP integration
• Treasury and reconciliation dashboards: internal finance tools, multi-currency, audit trails
• Investment platforms: portfolio management, order entry, real-time pricing

Compliance we design for

• PCI-DSS: the path of least scope is to never touch card data directly — use Stripe Elements or equivalent tokenization. We architect for this by default.
• KYC and AML: integrate with Jumio, Onfido, or Sumsub for identity verification; SARS reporting hooks where relevant.
• GDPR: data-residency controls, deletion workflows, audit logs, DPA-friendly architectures.
• SOC 2: security controls, change management, vendor management, incident response. We deliver Type I-ready builds; clients run the audit with their preferred firm.
• SBP / regional regulations: for Pakistani fintech, we work with the SBP regulatory framework where applicable.

Patterns that matter for fintech

• Idempotency everywhere. Every state-changing endpoint takes an idempotency key. Stripe-style header.
• Append-only ledgers. Financial state is an event log, not a mutable record. We use this pattern for any money-movement system.
• Decimal arithmetic, never floats. Money is always stored as integer minor units (cents/paisa) or as Postgres NUMERIC. Floats break in fintech.
• Reconciliation jobs. Every fintech system needs daily reconciliation against external sources (banks, payment processors). We build these from day one.
• Audit logging. Every action — every read of sensitive data, every state change — written to an immutable audit trail.
• Manual review queues. Edge cases that exceed automated thresholds go to human review. We build the queues, the SLAs, and the escalation logic.

Frequently Asked Questions

Can you ship a PCI-DSS compliant payment flow?

Yes, using scope-minimizing patterns (Stripe Elements, tokenization, Hosted Checkout) that keep raw card data off your infrastructure. For higher-scope flows where you need to handle card data, we work with your QSA to design compliant architecture but recommend against doing this unless absolutely necessary.

Do you have experience with Pakistani payment rails?

Yes. We've integrated Easypaisa, JazzCash, 1LINK, Raast (the SBP instant-payment system), and traditional bank wires for Pakistani fintech products. Each has quirks; we know them.

How long does fintech development typically take?

Longer than equivalent non-fintech. A payment-integrated MVP is 16-24 weeks. A neobank or wallet MVP is 20-32 weeks. A full lending platform is 24-40 weeks. The compliance overhead is real.

Can you handle real-time / high-throughput requirements?

Yes. For real-time trading, payments, or order entry we build event-driven architectures on Kafka / Redpanda / SQS with appropriate latency budgets. We measure and report P99 latencies as part of standard delivery.