Nullam dignissim, ante scelerisque the is euismod fermentum odio sem semper the is erat, a feugiat leo urna eget eros. Duis Aenean a imperdiet risus.
Loading
Nullam dignissim, ante scelerisque the is euismod fermentum odio sem semper the is erat, a feugiat leo urna eget eros. Duis Aenean a imperdiet risus.
Most businesses run on a patchwork of disconnected tools — a CRM that doesn't talk to the ERP, a payment gateway that isn't synced with inventory, a marketplace that needs manual order imports every morning. Every disconnection costs time, introduces errors, and creates a ceiling on how fast you can scale.
At Growth NextGen, we design, build, and maintain API integrations that connect your platforms, automate your workflows, and eliminate the manual data handling that slows your team down. Whether it's a simple webhook setup, a complex multi-system sync, or a custom REST API built from scratch — we handle every layer of the integration so your systems talk to each other reliably, in real time.
What We Deliver
From payment gateways and CRMs to marketplaces and custom APIs — every integration built for reliability, speed, and zero data loss.
Razorpay, PayU, Stripe, Cashfree, and PhonePe integrations — checkout flows, subscription billing, refund handling, webhook processing, and reconciliation-ready transaction logs.
Amazon SP-API, Flipkart, Shopify, WooCommerce, and Meesho integrations — product sync, order pull, inventory updates, and shipment tracking automated across all platforms.
HubSpot, Salesforce, Zoho CRM, Mailchimp, and WhatsApp Business API integrations — lead capture, contact sync, automated follow-ups, and campaign triggers connected to your product.
Tally, SAP, Unicommerce, and custom ERP integrations — real-time inventory sync, order flow automation, invoice generation, and multi-warehouse stock management across platforms.
Custom API design and development — RESTful and GraphQL APIs built with Laravel or Node.js, documented with Swagger/Postman, and secured with OAuth2, JWT, or API key authentication.
Real-time webhook setup, event-driven automation pipelines, and Zapier/Make equivalent custom workflows — eliminating manual data entry and keeping all your systems in sync automatically.
Integration Types
Two distinct disciplines — and most businesses need both at different stages of growth.
Connecting your existing product to external platforms and services — payment gateways, marketplaces, CRMs, logistics providers, and communication tools — using their published APIs.
Best for: Businesses connecting existing tools and platforms
Building your own REST or GraphQL API from scratch — for mobile apps, partner integrations, B2B data exchange, or exposing your platform's functionality to external consumers.
Best for: SaaS products, mobile app backends, B2B platforms
Our Process
A structured integration delivery process — from requirements mapping to live monitoring — with zero data surprises.
We map every system involved — data sources, destinations, triggers, and transformation rules — producing a clear integration architecture document before any code is written.
We design the authentication and authorisation model — OAuth2, JWT, API keys, or webhook signature verification — ensuring every data exchange is secure, auditable, and access-controlled.
The integration is built in a staging environment with full error handling, retry logic, idempotency controls, and structured logging — so failures are caught, retried, and never result in data loss.
Every data flow is tested end-to-end in sandbox environments — happy path, edge cases, error responses, rate limits, and timeout scenarios — before a single request touches the production system.
Controlled production rollout with monitoring dashboards active from minute one — error rates, latency, sync lag, and webhook delivery success tracked in real time during and after go-live.
Post-launch monitoring with automated alerting for failures, API deprecation notices, and rate limit breaches — plus documentation handed over so your team understands every integration we build.
Popular Integrations
From India's most-used payment gateways to global CRMs and logistics APIs — we've integrated them all and know every edge case.
Razorpay, Stripe, PayU, Cashfree, and PhonePe — checkout, subscriptions, refunds, webhooks, and payment reconciliation integrated cleanly into your platform.
Amazon SP-API, Flipkart Seller API, Shopify, WooCommerce, and Meesho — product sync, order management, inventory updates, and shipment tracking automated end to end.
Shiprocket, Delhivery, Ecom Express, Bluedart, and FedEx APIs — order push, AWB generation, real-time tracking, and delivery status webhooks integrated into your platform.
WhatsApp Business API (360dialog, Interakt, Wati), Twilio, and MSG91 — transactional messages, OTP delivery, order notifications, and chatbot workflow integrations.
HubSpot, Salesforce, Zoho CRM, Mailchimp, and Klaviyo — lead sync, contact management, deal pipeline automation, and campaign triggers connected to your product events.
Tally, SAP, Unicommerce, Vinculum, and custom ERP systems — real-time inventory sync, purchase order automation, invoice generation, and multi-location stock management.
Case Studies
Real businesses. Real disconnected systems. Real outcomes after integration.
D2C Brand / Multi-Platform
A D2C brand was manually copying orders from Amazon and Flipkart into their Shopify backend every morning — a 3-hour daily process prone to errors and delays. We built a unified order management integration pulling orders from both marketplace APIs into Shopify in real time, with inventory sync pushing stock levels back to all three platforms simultaneously. The 3-hour daily task was fully eliminated on day one of go-live.
SaaS Platform / Payments
A SaaS business was manually raising invoices and tracking payments for 2,000 subscribers in a spreadsheet. We integrated Razorpay Subscriptions into their Laravel platform — automated plan creation, subscription activation, renewal billing, failed payment retries, dunning emails, and cancellation workflows. Revenue leakage from missed renewals dropped to zero within the first billing cycle.
Logistics Startup / Tracking
A logistics aggregator needed a unified tracking layer across three courier partners with inconsistent webhook formats and unreliable delivery event timing. We built a normalised tracking integration that ingested webhooks from all three carriers, standardised event formats, stored delivery timelines, and pushed real-time status updates to the customer-facing tracking page and WhatsApp notifications. Tracking accuracy reached 99.2% across all shipments.
B2B Platform / ERP Sync
A B2B wholesale platform was exporting data to Excel and manually entering it into Tally every evening — a process taking 90 minutes daily and causing day-end reconciliation mismatches. We built a bidirectional Tally integration using Tally XML API — sales orders created on the platform triggered invoice generation in Tally automatically, with payment confirmations and stock updates flowing back in real time.
FAQ
Standard third-party integrations — payment gateways, CRMs, or shipping APIs — typically take 3 to 7 business days depending on the complexity of the data flow. Multi-system integrations with custom transformation logic or ERP connections take 2 to 4 weeks. Custom API development for a new backend takes 3 to 6 weeks depending on scope. We provide a fixed timeline after the scoping call.
We build all integrations with this in mind. Every integration includes retry logic, graceful error handling, and failure alerting — so if an external API is down, your system queues the requests and retries automatically rather than dropping data. For API version changes, we monitor deprecation notices and update the integration proactively before the old version is shut down.
Yes — always. Every integration we deliver includes technical documentation covering the data flow, field mappings, authentication setup, error codes, and operational runbook for your team. We also deliver Postman collections for any custom APIs we build, so your developers can test and extend the integration independently.
In many cases, yes. If a system supports data export (CSV, XML, EDI) or has a database we can access, we can build an integration layer that bridges the gap. For platforms like Tally that use XML-based communication rather than a REST API, we have specialist experience building reliable integrations using their native protocols.
All integrations are built with security as a first principle — HTTPS-only communication, OAuth2 or JWT authentication, webhook signature verification, encrypted credential storage, and access scoped to the minimum permissions required. We never store sensitive payment data — all PCI-scope data stays within the payment gateway's certified environment.
Yes — we offer monthly integration maintenance retainers covering monitoring, failure alerting, API version updates, and minor changes. For businesses with multiple live integrations, a retainer is the most cost-effective way to ensure everything keeps running reliably as third-party APIs evolve.
Tell us what you need connected and we'll map it out for free!
A free integration scoping call takes 30 minutes. We'll map out exactly what needs to be connected, how, and what it will cost — no guesswork.