You will get secure payment gateway integration for your website or app
Project details
Accept payments with confidence.
I provide secure payment gateway integration for websites, web applications, and mobile apps. Whether you're launching a new product or upgrading an existing system, I'll ensure your payment flow is fast, secure, and reliable.
### What I Can Integrate
✓ Stripe
✓ PayPal
✓ Razorpay
✓ Square
✓ Authorize.Net
✓ Braintree
✓ Paystack
✓ Flutterwave
✓ Mollie
✓ Wise
✓ Custom Payment APIs
### Services Included
• Payment Gateway Integration
• One-Time Payments
• Subscription Billing
• Checkout Integration
• Webhook Setup
• Payment Verification
• Refund & Cancellation Flow
• Secure Authentication
• API Integration
• Mobile & Web Integration
• Testing & Debugging
• Payment Flow Optimization
Perfect for eCommerce stores, SaaS platforms, marketplaces, booking systems, mobile apps, and custom business applications.
I provide secure payment gateway integration for websites, web applications, and mobile apps. Whether you're launching a new product or upgrading an existing system, I'll ensure your payment flow is fast, secure, and reliable.
### What I Can Integrate
✓ Stripe
✓ PayPal
✓ Razorpay
✓ Square
✓ Authorize.Net
✓ Braintree
✓ Paystack
✓ Flutterwave
✓ Mollie
✓ Wise
✓ Custom Payment APIs
### Services Included
• Payment Gateway Integration
• One-Time Payments
• Subscription Billing
• Checkout Integration
• Webhook Setup
• Payment Verification
• Refund & Cancellation Flow
• Secure Authentication
• API Integration
• Mobile & Web Integration
• Testing & Debugging
• Payment Flow Optimization
Perfect for eCommerce stores, SaaS platforms, marketplaces, booking systems, mobile apps, and custom business applications.
Programming Languages
PHP, JavaScript, TypeScriptCoding Expertise
Cross Browser & Device Compatibility, Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$199
|
Standard
$399
|
Advanced
$499
|
|---|---|---|---|
| Delivery Time | 3 days | 4 days | 5 days |
Number of Revisions | 0 | 1 | 2 |
Number of Pages | 4 | 5 | 6 |
Design Customization | - | ||
Content Upload | - | - | |
Responsive Design | |||
Source Code | - | - |
About Hardeep
Mobile & web app developer | Flutter Dart | Fullstack developer
Mohali, India - 4:12 pm local time
I am a Full-Stack Developer, AI Automation Engineer, and Mobile App Developer helping startups, businesses, and founders build reliable digital products.
I work across web, mobile, backend, SaaS, AI integrations, automation, and APIs, with a focus on building products that are practical, scalable, and easy to maintain.
I don’t just focus on writing code. I first understand what the product needs to achieve, then choose the right technology and architecture to build it properly.
Whether you’re starting a new product, improving an existing application, integrating AI, or automating a business process, I can help take it from idea to production.
What I Can Help With
➤ Full-Stack Web Development
➤ Mobile App Development
➤ SaaS Product Development
➤ AI & LLM Integration
➤ AI Agents & Chatbots
➤ Business Process Automation
➤ n8n / Make / Zapier Automation
➤ REST API & Third-Party Integrations
➤ Backend Development
➤ Database Design
➤ Payment Gateway Integration
➤ Cloud Deployment & DevOps
➤ Bug Fixing & Performance Optimization
➤ Long-Term Development & Support
Technical Skills
Frontend
React • Next.js • TypeScript • JavaScript • HTML • CSS • Tailwind CSS
Backend
Node.js • NestJS • Python • FastAPI • REST APIs • GraphQL
Mobile
Flutter • React Native • Android • iOS • Cross-Platform Development
AI
OpenAI • Gemini • LLM APIs • AI Chatbots • AI Agents • RAG • Embeddings • Vector Databases • Prompt Engineering
Automation
n8n • Make • Zapier • CRM Automation • Lead Automation • Email Automation • API Workflows
Databases
PostgreSQL • MySQL • MongoDB • Firebase • Supabase • Redis
Cloud & DevOps
AWS • Google Cloud • Azure • Docker • CI/CD • GitHub Actions • Cloudflare • Linux
Payments & Integrations
Stripe • PayPal • Razorpay • Shopify APIs • Payment APIs • OAuth • Webhooks
Products I Build
✔ SaaS Platforms
✔ AI-Powered Applications
✔ Business Automation Systems
✔ CRM & Admin Dashboards
✔ E-commerce Platforms
✔ Mobile Applications
✔ AI Chatbots & Assistants
✔ Internal Business Tools
✔ API-Based Applications
✔ Subscription Platforms
✔ Marketplace Platforms
✔ Workflow Automation Systems
My Approach
1. Understand
I first understand your business, users, existing system, and goals.
2. Plan
I recommend the right stack and break the project into clear milestones.
3. Build
I develop the frontend, backend, APIs, integrations, and automation.
4. Test
I test the important workflows, edge cases, integrations, and performance.
5. Deploy
I handle the production setup, deployment, domains, SSL, and required cloud configuration.
6. Support
After launch, I can continue with improvements, maintenance, new features, and scaling.
Why Work With Me?
✔ Full-stack development experience
✔ Strong API and integration knowledge
✔ AI and automation experience
✔ Clean and maintainable code
✔ Scalable architecture
✔ Practical problem-solving
✔ Clear communication
✔ Regular updates
✔ Comfortable working with existing codebases
✔ Long-term support available
I am comfortable working independently or alongside an existing team and can step into an existing project, understand the current setup, and continue development without unnecessary disruption.
Let's Build Something Useful
If you have an idea, an existing product that needs improvement, or a business process that you want to automate, feel free to message me.
Tell me what you're trying to build or improve, and I’ll be happy to discuss the best way to approach it.
Herdeep Singh
Steps for completing your project
After purchasing the project, send requirements so Hardeep can start the project.
Delivery time starts when Hardeep receives requirements from you.
Hardeep works on your project following the steps below.
Revisions may occur after the delivery date.
Lets connect over chat first :)