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API Development & Third-Party Integration
Connect your business systems seamlessly — secure custom APIs and integrations for payments, SMS, AI, shipping and more.
Need your apps, website and tools to work as one? I design and build secure REST APIs and integrate the third-party services your business depends on — payment gateways (bKash, Nagad, SSLCommerz, Stripe), SMS & OTP, AI platforms (OpenAI, Claude, Gemini), courier/shipping (Pathao, Steadfast, RedX) and ERP/CRM/accounting systems. Every integration is built with secure authentication, retries, logging and clear documentation, so data flows reliably and your team stops copying it by hand.
What you get
Secure custom APIs
REST APIs with token auth so your apps and partners exchange data safely.
Payment gateway integration
bKash, Nagad, Rocket, SSLCommerz, aamarPay, Stripe and cards.
SMS, OTP & notifications
OTP login, alerts and bulk SMS via local & global providers.
AI platform integration
OpenAI, Claude and Gemini built into your website or system.
Courier & shipping
Pathao, Steadfast, RedX for automated booking & tracking.
Reliable by design
Retries, logging, webhooks and docs so a failed call never loses data.
API & integration pricing
Indicative ranges — final quote depends on the services & scope.
Single Integration
৳10,000 – ৳25,000
- One gateway / SMS / API
- Secure server-side handling
- Sandbox + live testing
Custom API + Integrations
৳30,000 – ৳90,000
- Custom REST API + auth
- Multiple third-party services
- Webhooks, logging & docs
Enterprise / Scale
৳100,000+
- ERP/CRM & system-to-system sync
- Queues, rate limiting, monitoring
- Scalable cloud architecture
* Prices are indicative. Final quote depends on your exact requirements.
How the integration is built
1. Map
We list the systems and data that need to talk to each other.
2. Design
Define endpoints, auth, payloads and error handling.
3. Build & test
Develop, test in sandbox, then verify on live with logs.
4. Document & support
Hand over clear docs and stay available for changes.
Frequently asked questions
Can you add an integration to my existing system?
Yes. I integrate payment gateways, SMS, AI, courier and other services into your existing website, app or software — whatever technology it uses.
Which third-party services can you connect?
Payment gateways (bKash, Nagad, SSLCommerz, Stripe), SMS/OTP providers, AI platforms (OpenAI, Claude, Gemini), couriers (Pathao, Steadfast, RedX), maps, accounting and most services with a public API.
Will I get documentation for the API?
Yes. Every API comes with clear documentation so your team or future developers can use and extend it easily.
How do you keep integrations reliable?
With secure authentication, retries, webhooks and full logging, so a failed call never silently loses data — and issues are easy to trace.
Let's discuss your project
Tell me what you need and get a free, no-obligation quote. I usually reply fast.