You will get Stripe or PayPal payment gateway integration into your website securely
Top Rated
Project details
I specialize in integrating secure and reliable payment gateways like PayPal and Stripe into websites and web applications. With over 7+ years of experience, I have worked with international clients on custom PHP, WordPress, WooCommerce, and modern web applications.
I can implement full payment solutions or fix existing issues to ensure smooth and secure transactions.
PayPal Services:
Buy Now, Donate, and Subscription buttons
Express Checkout integration
Payflow integration
Payment bug fixing and troubleshooting
Stripe Services:
Payment gateway integration
Custom checkout forms
Stripe Connect (marketplace setup)
Subscription billing integration
Customer and card management
Refunds and payment issue fixes
I also handle third-party payment gateway integrations and API-based billing systems. Please message me before placing an order to discuss your requirements clearly.
I can implement full payment solutions or fix existing issues to ensure smooth and secure transactions.
PayPal Services:
Buy Now, Donate, and Subscription buttons
Express Checkout integration
Payflow integration
Payment bug fixing and troubleshooting
Stripe Services:
Payment gateway integration
Custom checkout forms
Stripe Connect (marketplace setup)
Subscription billing integration
Customer and card management
Refunds and payment issue fixes
I also handle third-party payment gateway integrations and API-based billing systems. Please message me before placing an order to discuss your requirements clearly.
Programming Languages
PHP, JavaScript, C#Coding Expertise
Cross Browser & Device Compatibility, Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$99
|
Standard
$149
|
Advanced
$199
|
|---|---|---|---|
| Delivery Time | 2 days | 3 days | 3 days |
Number of Revisions | 0 | 0 | 0 |
Design Customization | - | - | |
Content Upload | - | - | |
Responsive Design | |||
Source Code |
Optional add-ons
You can add these on the next page.
Fast Delivery
+$299 - $499
36 reviews
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WM
Will M.
Jun 5, 2026
Full Stack Development & AI engineer
Very skilled developer
EG
Eric G.
Jun 1, 2026
Automation, Integration & Chatbot Developer (APIs, Databases, AI Workflows)
Was very good working with Shabir. He communicated well, and delivered on what was requested/agreed on. Accepted feedback nicely and made adjustments at my request. A good experience.
JB
Jeff B.
May 18, 2026
Hourly Programming Work
Good guy to work with.
TO
Teona O.
May 14, 2026
illustration of book
perfect work done! recommend everyone
WM
Will M.
May 12, 2026
Working on Application
About Shabir
Full-Stack AI Engineer | SaaS Architect
100%
Job Success
Lahore, Pakistan - 8:42 am local time
As a Full Stack AI Engineer with 10+ years of software development experience, I specialize in building AI-powered applications, autonomous AI agents, production-grade RAG systems, and robust SaaS architectures. I combine deep product thinking, modern system architecture, and hands-on full-stack development to deliver secure, scalable, and production-ready software that drives real business value.
What I Can Build For You as Your Full Stack AI Engineer:
- AI-Powered SaaS Applications
- AI Agents & Business Automation
- RAG (Retrieval-Augmented Generation) Systems
- Custom Full Stack Web Applications
- SaaS Platforms & Multi-Tenant Architectures
- API Development & Third-Party Integrations
- Legacy System Modernization
- System Design & Technical Architecture
- Multi-Agent Workflows
- ComfyUI Custom Workflows
DOMAIN SPECIALTIES & BUSINESS IMPACT
Full-Stack AI & SaaS Core Infrastructure:
I build the entire multi-tenant SaaS ecosystem around your AI—handling frontend UX, secure token management, and robust backend infrastructure so it scales smoothly.
Autonomous Agents & Full Stack AI Logic:
I deploy multi-agent orchestrations (LangGraph, LangChain, CrewAI) that plug directly into your SaaS backend to automate complex business logic, background processing, and intelligent decision-making.
Production-Grade RAG & Data Architecture:
I engineer highly accurate Retrieval-Augmented Generation systems, setting up secure metadata filtering and optimized vector databases (Pinecone, Qdrant, pgvector) that sync perfectly with your application’s data layer.
Low-Latency Voice & Full-Stack Streaming: I implement the WebSockets and state management required for sub-500ms real-time voice assistants (Deepgram, ElevenLabs, OpenAI Whisper), ensuring live streaming works flawlessly.
Custom E-Signature Platforms & Document Workflows:
I architect secure, compliant digital signature systems from the ground up. This combines frontend canvas-based signing with heavy backend engineering, including secure document hashing, immutable audit trails, and complex, multi-party signing state machines (parallel, sequential, and conditional signing logic).
Technical Stack Matrix
AI & Agentic Frameworks:
OpenAI, Claude, Gemini, LangGraph, LangChain, CrewAI, AutoGen, Vector DBs (Pinecone, Qdrant, pgvector)
Frontend Development:
React.js, Next.js, Vue.js, TypeScript, Tailwind CSS
Backend Engineering:
Node.js, .NET Core, ASP.NET Core, Python, FastAPI, Django, Laravel
Cloud & Infrastructure:
AWS, Docker, PostgreSQL, MySQL, Redis, Supabase
Workflows & Automation:
ComfyUI, n8n, Zapier, Make, LangFlow
Integrations:
Stripe, Twilio, Google Workspace, Slack, Zoom, Meta APIs, and custom enterprise REST/GraphQL APIs
Why Clients Partner With Me:
• 10+ years of hands-on engineering experience across frontend, backend, and AI layers.
• 70+ projects successfully delivered from initial concept to live production.
• Strong system design background ensuring your software is built right the first time.
• Fast execution without compromising on security, readability, or code quality.
• Ownership mindset—I act as a technical partner, not just a task-taker.
⏱ Availability & Engagement:
Hours: 40–50 hours/week | Full-time availability
Focus: Long-term enterprise contracts, complex SaaS architecture, full-stack AI integrations, and ongoing product development partnerships.
𝑰𝒇 𝒚𝒐𝒖 𝒏𝒆𝒆𝒅 𝒂 𝑭𝒖𝒍𝒍 𝑺𝒕𝒂𝒄𝒌 𝑨𝑰 𝑬𝒏𝒈𝒊𝒏𝒆𝒆𝒓 𝒘𝒉𝒐 𝒄𝒂𝒏 𝒅𝒆𝒔𝒊𝒈𝒏, 𝒃𝒖𝒊𝒍𝒅, 𝒂𝒏𝒅 𝒔𝒄𝒂𝒍𝒆 𝒚𝒐𝒖𝒓 𝒑𝒓𝒐𝒅𝒖𝒄𝒕 𝒇𝒓𝒐𝒎 𝒄𝒐𝒏𝒄𝒆𝒑𝒕 𝒕𝒐 𝒑𝒓𝒐𝒅𝒖𝒄𝒕𝒊𝒐𝒏, 𝒍𝒆𝒕’𝒔 𝒄𝒐𝒏𝒏𝒆𝒄𝒕.
Steps for completing your project
After purchasing the project, send requirements so Shabir can start the project.
Delivery time starts when Shabir receives requirements from you.
Shabir works on your project following the steps below.
Revisions may occur after the delivery date.
Integration with Paypal or Stripe Review
Make integration with Paypal or Stripe with sandbox credentials. Make a video for client review.
Remove sandbox credentials and add original account credentials
Remove the sandbox credentials and add original account credentials after review successfull.