API integration services — connect everything, one reliable layer
As an API integration services partner based in Pune, we connect payment gateways, accounting systems, GST portals and SaaS tools into one reliable data layer — so your apps, CRM and operations stay in sync without manual copy-paste. You own the code, the credentials and the roadmap.
- Free, no-obligation integration quote in 24 hours
- REST, GraphQL, webhooks, Node.js & Python
- India-ready: Razorpay, Tally, GST & WhatsApp API
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Integrations we've shipped in production
Razorpay · Tally · GST portal · WhatsApp Business API · Third-party SaaS
API integrations for real business systems
Razorpay, PayU and Stripe integrations with webhooks, refunds, subscription billing and reconciliation built in.
Bidirectional sync between your app and Tally — invoices, ledgers, stock and payment entries without re-keying.
GST portal integration, IRN generation, e-way bills and compliance reporting wired into your billing workflow.
WhatsApp Business API for order updates, OTPs, support tickets and marketing templates — triggered from your systems.
CRM, ERP, Shopify, Zoho, shipping providers and internal tools connected through reliable middleware.
APIs you own — documented, versioned and secured with OAuth — powering web, mobile and partner integrations.
Manual data entry vs API integrations
Volume is low, systems rarely change, you have a tiny team and the cost of a typo is negligible. Copy-paste between spreadsheets and Tally works — until volume or complexity outgrows it.
The same data moves between systems daily, errors cost money, real-time sync matters, or your team spends hours re-entering orders, invoices and payments. That's when API integration services pay for themselves.
A simple, transparent process
A free call to map your systems, data flows and integration goals.
Integration diagram, API list and honest cost range within 24 hours.
Auth strategy, data mapping and error-handling plan agreed before build.
Connectors built in stages with sandbox testing and real-data validation.
Production deployment, monitoring setup and team handover with docs.
Alerting, fixes when APIs change and new connectors as you scale.
Rated 4.9/5 by the teams we build for
“Bestest work provided by TechLapse and team. A genuinely good company for automation services.”
Growweb DevelopmentCRM & API integrations“We built a complete food delivery app with TechLapse. Good resources, timely work and solid support throughout.”
DropEatRazorpay & WhatsApp API“We developed a custom laundry service app — best UI/UX and a smooth-performing app. TechLapse is the best in this field.”
Breezy Mart LLPPayment & notification APIs
Why TechLapse for API integrations
We ship real integrations. Razorpay payments, Tally accounting sync, GST portal e-invoicing and WhatsApp Business API connectors run in production for clients across India — not just proof-of-concept demos.
Built to last. REST, GraphQL, webhooks and OAuth middleware with retry logic, logging and monitoring — so integrations survive API changes and traffic spikes.
Built for India. GST compliance, Razorpay, Tally, UPI and WhatsApp Business API handled from day one with India-specific edge cases covered.
You own everything. Source code, API credentials, integration configs and documentation are yours — no vendor lock-in, no per-transaction fees to us.
Why work with TechLapse? Download our overview (PDF) See more of our work →Ready to connect your systems?
Get a free, no-obligation quote with timelines and a clear cost range within 24 hours.
Get my free quote WhatsApp usYour questions, answered
What are API integration services?
API integration services connect your software to external systems — payment gateways, accounting tools, GST portals, WhatsApp and SaaS platforms — so data flows automatically instead of being copied by hand. We design, build and maintain the integration layer that keeps everything in sync.
How much do API integration services cost in India?
Cost depends on how many systems are involved, how complex the data mapping is and whether you need a one-way sync or bidirectional flows with error handling. A single third-party integration typically takes one to two weeks; multi-system middleware projects run longer and are delivered in phases. Share your stack and we'll give you a clear cost range within 24 hours.
How long does an API integration take?
A focused integration — Razorpay payments, Tally invoice sync or WhatsApp notifications — usually goes live in one to two weeks. Multi-system projects with custom REST APIs, OAuth flows and webhook pipelines typically take four to eight weeks. We prioritise high-impact connections first so you see value early.
What is the difference between an API and an integration?
An API is the interface a system exposes — endpoints, webhooks and authentication rules. An integration is the implementation that connects two or more systems using those APIs: data mapping, retry logic, error handling and monitoring. We do both — build custom APIs and wire up third-party ones.
Can you integrate with Razorpay, Tally, GST portal or WhatsApp Business API?
Yes. We have production experience with Razorpay and other payment gateways, Tally and accounting sync, GST e-invoicing and IRN generation, WhatsApp Business API messaging, and dozens of Indian and global SaaS tools. If a system has an API, webhook or file export, we can usually connect it.
Which technologies do you use for API integrations?
REST and GraphQL for request/response APIs, webhooks for event-driven flows, Node.js and Python for integration middleware, OAuth 2.0 for secure third-party auth, and PostgreSQL or Redis for queues and state — chosen per project for reliability and maintainability.
Do you build custom REST and GraphQL APIs?
Yes. We design and document custom REST and GraphQL APIs when your product needs to expose data to partners, mobile apps or internal tools. Every API includes authentication, rate limiting, validation, Swagger or Postman documentation and versioning strategy.
Who owns the integration code and documentation?
You do. Source code, API credentials, integration configs and documentation belong to you. We can sign an NDA before you share anything sensitive and hand over full access at delivery.
Do you provide support after integration goes live?
Yes. We offer monitoring, fixes when third-party APIs change, performance tuning and new connector modules as your stack grows. Many clients start with one integration — payments or Tally sync — and expand once they see the time saved.
Let's connect your systems
Free consultation, honest advice, and a clear quote in 24 hours — with no obligation.
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