API Development & Integration that connects everything
Your payment gateway, CRM, website, app and accounting tool should talk to each other. We build and integrate APIs that are secure, documented and dependable.
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API Development & Integration by Nextinera
Nextinera is a software development company based in Bareilly, Uttar Pradesh, delivering API development and integration to startups, SMEs and enterprises across India, the USA and Cyprus. Every engagement begins with a free consultation and a confidential project analysis, so you know the scope, timeline and cost before you commit.
You get a dedicated team, regular demos, full source-code ownership and post-launch support. Secure REST and GraphQL APIs and third-party integrations that connect your systems.
Technologies & tools
Ideal for
- Marketplace and partner APIs
- Mobile app backends
- Accounting sync
- Courier and payment automation
API Development & Integration capabilities
Everything below can be combined and scaled to fit your budget and timeline.
REST & GraphQL APIs
Clean, versioned and rate-limited APIs for web, mobile and partners.
Payment gateways
Razorpay, Stripe, PayPal, Cashfree, PayU, UPI and wallet integrations.
Messaging
WhatsApp Business API, SMS, email and push notifications.
Logistics & shipping
Shiprocket, Delhivery and courier APIs for rates, labels and tracking.
ERP / CRM sync
Two-way data sync with Zoho, Tally, SAP, HubSpot and custom systems.
Documentation & testing
Swagger/OpenAPI docs, Postman collections and automated tests.
Why choose us for API development & integration
Less manual work
Data flows automatically between tools.
Secure by default
OAuth2, JWT, signed webhooks and input validation.
Reliable
Retries, queues and logging for failed calls.
Easy to extend
Versioned contracts let you add partners safely.
Is API Development & Integration right for you?
Choose API work when systems need to exchange data automatically, when you want a mobile app or partners to use your platform, or when manual re-entry between tools wastes time.
Typical timeline: 1-6 weeks for typical integrations; large partner APIs take longer.
Estimate your budgetWhat affects the cost
- Number and complexity of third-party APIs
- Authentication and security requirements
- Volume and retry/queue needs
- Documentation and testing depth
Every project is quoted fixed-scope after a free consultation. See pricing.
Common mistakes we help you avoid
No error handling
Integrations fail silently without retries and logging.
Unversioned APIs
Changing responses breaks clients; version from the start.
Weak security
Always use tokens, HTTPS and signed webhooks.
What you receive
- API endpoints and integration code
- Authentication and rate limiting
- Logging and retry handling
- Swagger or Postman documentation
- Automated tests
Ready-to-customise solutions
From first call to launch and beyond
- 01
Discover
We study your goals, users and constraints, then agree scope, timeline and a fixed quote.
- 02
Design
Wireframes and UI prototypes you can click through before development starts.
- 03
Build
Agile sprints with demos every 1-2 weeks and clean, documented code.
- 04
Test
Manual and automated QA, performance and security checks before go-live.
- 05
Launch & Grow
Smooth deployment, training and ongoing support as you scale.
API Development & Integration: common questions
Can you integrate any third-party service?
If the service exposes an API or SDK we can integrate it. We review documentation before quoting.
How do you secure APIs?
Token-based authentication, HTTPS only, input validation, rate limiting and audit logs.
Do you provide API documentation?
Yes, interactive Swagger/OpenAPI docs plus Postman collections.
Can you fix an existing broken integration?
Yes. We debug, harden and document existing integrations.
Experience across sectors
Related services
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- Mobile App DevelopmentAndroid, iOS and cross-platform apps with smooth UX, offline support and secure backends.
Let's discuss your API development & integration project
Tell us about your idea. Get a free consultation, a confidential project analysis and a custom roadmap.