CodeAj Tech logo

Connect your systems so data stops living in silos

We design and build API integrations between your website, app, and the third-party platforms you already run on — payment gateways, CRMs, ERPs, shipping, and more — so your team isn't re-entering the same data twice.

Most businesses don't need one giant platform — they need the systems they already use to talk to each other reliably. A new order should land in your CRM automatically. A payment should update your accounting software without manual entry. An inventory change should sync across your website and your warehouse system in real time.

We build these integrations properly: handling authentication, rate limits, retries, and failure cases, not just the happy path. Where a ready-made integration doesn't exist, we build a custom API or middleware layer that fills the gap.

What’s included

Payment Gateway Integration

Stripe, Razorpay, PayPal, and other payment providers wired in securely.

CRM Integration

Syncing leads and customer data with Salesforce, HubSpot, Zoho, and others.

ERP Integration

Connecting your website or app to SAP, Oracle, or custom ERP systems.

Accounting Software Integration

QuickBooks, Xero, Tally, and similar platforms kept in sync.

Shipping & Logistics API Integration

Real-time rates, tracking, and label generation from carrier APIs.

Email & SMS Gateway Integration

Transactional and marketing messaging through your preferred provider.

Social Media API Integration

Publishing, data pulls, and login via social platform APIs.

Marketplace API Integration

Syncing listings and orders with Amazon, Flipkart, and similar marketplaces.

Custom API Development

Building a new API when no off-the-shelf integration exists.

Webhook & Middleware Development

Event-driven connections between systems that don't natively talk to each other.

Third-Party SaaS Integration

Connecting tools like Slack, Zapier, calendars, and document systems.

Legacy System Integration

Bridging older internal systems with modern APIs and services.

Explore specific services

Dedicated pages for each api integration service we offer, with full scope and FAQs.

REST API Development

A well-documented REST API designed to power your web app, mobile app, or third-party integrations.

Learn more

GraphQL API Development

A GraphQL layer that lets client applications fetch exactly the data they need in a single request.

Learn more

Third-party API Integration

Connecting your product to an external platform's API, including auth, rate limits, and error handling.

Learn more

Payment Gateway Integration

Stripe, Razorpay, PayPal, or another payment provider wired in securely for real transactions.

Learn more

SMS & OTP Integration

Transactional SMS and OTP verification wired into your signup, login, or alert flows.

Learn more

Transactional Email Integration

Reliable delivery of password resets, receipts, and system notifications through a proper email provider.

Learn more

Google Maps & Location APIs

Maps, geocoding, and location search integrated into your app for addresses, routes, or coverage areas.

Learn more

Social & Single Sign-on

Login via Google, Apple, or other identity providers, or a proper SSO setup for internal tools.

Learn more

Shipping & Logistics APIs

Real-time shipping rates, tracking, and label generation pulled directly from carrier APIs.

Learn more

AI / LLM API Integration

Wiring an LLM provider's API into your product safely, with cost and rate-limit handling in place.

Learn more

Webhooks & Event Integrations

Event-driven connections so your systems react to changes elsewhere the moment they happen.

Learn more

API Testing & Documentation

Structured API testing and clear documentation so your team or partners can integrate without guesswork.

Learn more

What we deliver

  • A data flow map showing exactly what syncs where, and how often
  • Secure authentication (OAuth, API keys, webhooks) handled correctly for each platform
  • Error handling and retry logic so a temporary outage doesn't silently lose data
  • Logging and alerting so failed syncs are caught immediately, not discovered weeks later
  • Documentation your team can hand to a new developer without starting from scratch

Why it matters

Handles failure, not just success

Retry logic, error alerts, and logging so a dropped sync is caught immediately.

Secure by design

Proper OAuth, key rotation, and least-privilege access for every connected system.

Documented for your team

Clear documentation so future developers aren't reverse-engineering the integration.

Built to be monitored

Visibility into sync status, not a black box you only notice when it breaks.

Technology we use

Django REST FrameworkFastAPICeleryRedisREST/SOAP/GraphQL APIsOAuth 2.0Webhooks

Ways to engage

Single integration

One platform connected end-to-end with error handling and monitoring.

Integration platform

A middleware layer connecting multiple systems with a unified data flow.

Ongoing integration support

Monitoring and maintenance as connected platforms change their APIs.

Frequently asked questions

We assess alternatives — some platforms offer partner APIs, scheduled exports, or webhook options even without a fully public API. We'll tell you honestly if an integration isn't feasible.

Ready to talk about your api integration project?

Share a few details and we’ll follow up with next steps and a custom quote.