🚀 Building My Own Payment Gateway — From API to Real Payment Infrastructure
Most developers integrate payment gateways.
I decided to build one.
I'm currently working on Gurupay Gateway, a payment infrastructure project focused on building the core systems behind online payments rather than simply consuming someone else's API.
The goal is to understand what actually happens behind a payment:
Create Order → Initiate Payment → Process Transaction → Verify → Webhook → Settlement
🏗️ What I'm building
The platform is being designed around:
- 🔐 Secure API authentication
- 💳 Payment processing
- 🧾 Order & transaction management
- 🔄 Payment status tracking
- ⚡ Webhooks & callbacks
- 🔑 Signature verification
- 💰 Refund handling
- 📊 Merchant dashboard
- 📈 Transaction analytics
- 🛡️ Fraud & risk controls
- 🔌 REST APIs for developers
- 📱 Flutter/mobile integration
- 🧩 SDK/plugin support
The interesting part
The difficult part isn't creating a payment button.
The real challenge is building infrastructure that can reliably answer:
Did the customer actually pay?
And then handling everything that comes after it.
What happens if the payment succeeds but the callback fails?
What happens if a webhook arrives twice?
What happens if the customer closes the app during payment?
What happens when a transaction is pending?
What happens when a refund is requested?
These are the problems I'm trying to solve.
🎯 Developer-first approach
One of my goals is to make integration extremely simple.
For example, a developer should eventually be able to integrate the gateway through:
REST API
+
SDK
+
Flutter Plugin
+
Web Integration
without having to understand the entire payment infrastructure underneath.
🚧 Current stage
This is still a work in progress.
I'm building, testing, breaking things, fixing them, and learning from every failure.
I'll be sharing the journey here — architecture decisions, APIs, database design, security, integrations, bugs, and major milestones.
I'm not claiming to have built a production-scale payment network yet.
I'm building toward one.
If you're working on payment systems, fintech infrastructure, APIs, or developer platforms, I'd love to hear what problems you think I should solve next.
Let's build. 🚀
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