Financial API Development
Financial APIs for payments, accounts, ledgers, FX and data — designed for correctness, idempotency and partner adoption.
- ClientCheckout · wallet
- APIIdempotency key
- Identity & KYCVerified
- Risk & complianceRules passed
- Payment gatewayAuthorised → captured
- LedgerDouble-entry posted
- SettlementBank rail · T+1
Journal entry · balanced
| Account | Debit | Credit |
|---|---|---|
| Customer funds | 120.00 | — |
| Merchant payable | — | 118.20 |
| Fee revenue | — | 1.80 |
Division
Service area
Embedded Finance, BaaS & Open Banking
Engagement
Project · Team · Managed
Overview
Financial APIs carry obligations beyond typical APIs: exact decimal handling, idempotency for every money movement, consistent status models, reconciliation-friendly identifiers, webhooks with strong delivery guarantees and security that satisfies partners' due diligence. We design and build financial APIs — for payments, ledgers, accounts, FX, cards and financial data — that other businesses can integrate with confidence.
Common use cases
- Payment APIsInitiation, status and refunds for partners.
- Ledger-as-a-service APIsAccounting primitives for product teams.
- FX and quote APIsRates, quotes and conversions.
- Financial data APIsAggregated account and transaction data.
Quick answers
Financial API Development at a glance
The essentials in brief. Every project is scoped individually — ask us for specifics.
- What is financial API development?
- Financial APIs for payments, accounts, ledgers, FX and data — designed for correctness, idempotency and partner adoption.
- Who is it for?
- Typically neobanks, payment companies, lenders, wealth platforms and financial institutions building or modernising customer-facing and back-office systems.
- What does Shivacha provide?
- Money-safe design
- Idempotency keys
- Status models
- Webhooks
- Security
- Partner onboarding
- Which technologies are used?
- Open Banking APIs, OpenAPI, OAuth 2.0 & OIDC, Double-Entry Ledgers, Node.js, Go (Golang) — chosen to fit your stack and constraints.
- How does the process work?
- Use-case design → Partner selection support → API layer build → Embedded experience → Operate.
- What affects the cost?
- Banking, card, payment and KYC partners to integrate
- Ledger and reconciliation complexity
- Number of currencies, countries and payment rails
- Compliance, reporting and audit requirements
- Mobile, web and back-office scope
- Availability and disaster-recovery targets
- How long does it take?
- A regulated-market MVP usually takes 4–7 months including partner integrations; extensions to an existing platform can ship in weeks.
- How do I get started?
- Share a short brief in the form below, book a 30-minute call or message us on WhatsApp. A senior engineer replies within one business day; NDA on request.
Capabilities
What we deliver
Money-safe design
Minor units, currency codes and rounding rules.
Idempotency keys
Exactly-once semantics for money movement.
Status models
Clear, documented state machines.
Webhooks
Signed, retried event notifications.
Security
OAuth 2.0, mTLS and request signing.
Partner onboarding
Sandbox, docs and certification tests.
Architecture
Engineered right from day one
The layers we typically design for embedded finance, BaaS & open banking, adapted to your stack and partners.
- Unified APIOne internal API over multiple partners simplifies product teams' work.
- Consent & data rightsOpen banking consent captured, stored and revocable.
- Clear responsibilityLicensed partners' obligations reflected in flows and data handling.
- Developer experienceSandbox, documentation and SDKs for internal and external developers.
Delivery
How an engagement runs
- 1
Use-case design
Which financial features, for which users, and how they create value in the host product.
- 2
Partner selection support
Technical evaluation of BaaS, processor and data-aggregation partners.
- 3
API layer build
Unified financial APIs over partners, with webhooks and sandbox.
- 4
Embedded experience
Components and flows that match the host product's design.
- 5
Operate
Monitoring, reconciliation and partner reporting.
Security
Security built into delivery
Controls we apply by default on this kind of work — not a separate phase at the end.
Ledger integrity
Double-entry, immutable journals and daily reconciliation against partners.
Idempotent money movement
Every payment operation safe to retry, with no double-spend.
Access control
Maker-checker approvals, least privilege and full audit logging.
Data protection
Encryption in transit and at rest, tokenised card data and PCI-aware architecture.
Technology
Tools we use for this
Products
Start from a platform
Shivacha Banking API
Secure, versioned banking APIs over any core — with sandbox and developer portal.
Learn moreShivacha Digital Wallet
Stored-value wallets with top-ups, P2P, payments and rewards.
Learn moreShivacha Payment Gateway
A white-label payment gateway with hosted checkout, tokenisation and multi-acquirer connectivity.
Learn moreRelated services
Often combined with
Banking API Development
Banking APIs for accounts, payments, cards and data — secure, versioned and documented for partners and internal teams.
Learn moreEmbedded Finance Development
Embed accounts, payments, cards and lending into your product through licensed partners and a unified finance API layer.
Learn moreEmbedded Banking
Offer bank accounts and banking features inside your platform through sponsor banks — with native UX and unified ledgers.
Learn moreDedicated team
FinTech Engineering Team
Engineers experienced in ledgers, money movement and financial partner integrations.
Work & insights
Related thinking
Ledger-first architecture for a partner-bank neobank
How we structure a neobank so that balances always reconcile with the sponsor bank and partners can be added or replaced.
Learn moreStablecoin settlement layer for a card-accepting payment platform
A hybrid design that lets merchants accept cards as usual while optionally settling in stablecoins.
Learn moreYour ledger is your product: designing money movement that always reconciles
Fintech products are judged on experience but survive on correctness. A double-entry ledger at the core is what makes balances provable.
Learn moreFAQ
Frequently asked questions
How do you prevent duplicate payments via API?
Every money-moving request requires an idempotency key; repeated requests return the original result rather than executing twice.
Do you provide API SDKs?
Yes, typed SDKs for common languages generated from specifications and tested against the sandbox.
What is the difference between BaaS and embedded finance?
Banking-as-a-Service is the infrastructure — licensed banks exposing services through APIs. Embedded finance is the product outcome — a non-financial company offering those services inside its own experience. We build both sides.
Do you support open banking in multiple regions?
We integrate with open banking APIs and aggregators across regions. Coverage depends on the aggregator and the region's standards.
Next step
Discuss Your FinTech Product.
Tell us about your financial API development requirements — goals, timeline and constraints. We will reply with questions, an approach and next steps.
- Senior engineer reads every enquiry
- Reply within one business day
- NDA on request
Your details are used only to reply to this enquiry.