API development and integration
The plumbing that makes your systems one system: REST APIs we design, and third-party services integrated so reliably you forget they are third parties.
Included
What our API work covers
Custom REST APIs
Versioned, documented APIs powering your apps and partners, built to survive their own success.
Payment gateway integration
Stripe, Razorpay, PayPal and regional gateways with reconciliation, retries and webhooks done right.
WhatsApp Business API
Order updates, OTPs and support conversations through the channel your customers actually open.
Accounting and ERP sync
Tally, Zoho Books and custom ERPs kept in sync with your apps, ending double entry.
LLM API integration
OpenAI and other model APIs integrated with cost controls, fallbacks and monitoring, not weekend-demo wiring.
Legacy system bridges
Old systems that cannot change, wrapped in clean APIs so new software can talk to them.
Stack
Tools we use for this work
Why us
Why teams choose Codespark
Failure-first engineering
Timeouts, retries, idempotency and alerting designed in, because third parties fail and yours should not.
Documented for humans
Every API ships with docs and Postman collections your team and partners can use without calling us.
Cost-aware AI wiring
LLM integrations include token budgets, caching and model fallbacks so the bill stays predictable.
Approach
Integration is where projects quietly fail
Most software disasters we rescue trace back to integrations done optimistically: no retries, no logging, no plan for the day the other side changes. We treat every integration as a production system, because that is what it becomes.
Questions
Common questions
How much does API development or integration cost?
Single integrations typically run $2,000 to $8,000; full custom API platforms range higher. Fixed quote once we see the systems involved.
Can you integrate systems that have no API?
Usually yes. Between database-level access, file exchange and careful automation, most legacy systems can be bridged. We assess honestly before promising.
How do you keep integrations from breaking silently?
Monitoring and alerting on every integration, idempotent retries for transient failures, and logs that make incidents diagnosable in minutes rather than days.
Do you work with WhatsApp Business API?
Yes, regularly: transactional notifications, OTP flows and two-way support inboxes, including provider selection and Meta approval handling.
Related
Related services
Web application development
Customer portals, dashboards, SaaS products and internal tools built on Laravel, PHP and React.
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E-commerce development
Online stores that are fast at the exact moment it matters: checkout.
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AI development
AI features that answer from your data, with sources, and hold up in production: assistants, smart search, summarisation and document intelligence for the software you already run.
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