You will get secure payment gateway integration (Stripe, Checkout.com, Paypal)
Project details
I will integrate secure and reliable payment gateway solutions into your web application using Stripe, PayPal, or Checkout.com.
As a senior full-stack developer, I focus on building production-ready payment systems that handle real-world scenarios such as subscriptions, one-time payments, webhooks, and error handling.
You will get a clean, well-structured integration that is secure, scalable, and aligned with your existing backend (Node.js, .NET, PHP, or others).
I don’t just “connect APIs” — I ensure your payment flow works smoothly end-to-end, including backend logic, validation, and testing.
Whether you’re launching a new product or improving an existing system, I will deliver a robust solution that you can rely on.
As a senior full-stack developer, I focus on building production-ready payment systems that handle real-world scenarios such as subscriptions, one-time payments, webhooks, and error handling.
You will get a clean, well-structured integration that is secure, scalable, and aligned with your existing backend (Node.js, .NET, PHP, or others).
I don’t just “connect APIs” — I ensure your payment flow works smoothly end-to-end, including backend logic, validation, and testing.
Whether you’re launching a new product or improving an existing system, I will deliver a robust solution that you can rely on.
Programming Languages
PHP, JavaScript, C#Coding Expertise
Cross Browser & Device Compatibility, Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$149
|
Standard
$349
|
Advanced
$749
|
|---|---|---|---|
| Delivery Time | 2 days | 5 days | 10 days |
Number of Revisions | 1 | 2 | 3 |
Design Customization | - | - | - |
Content Upload | - | - | - |
Responsive Design | - | - | - |
Source Code | - | - | - |
Optional add-ons
You can add these on the next page.
Fast Delivery
+$250 - $1,000
Additional Revision
+$70
Add Subscription Billing
(+ 2 Days)
+$225
Advanced Security Setup (PCI, validation)
(+ 2 Days)
+$150Frequently asked questions
About Ertugrul Baki
Senior Full Stack Dev | Payments | SaaS | Scalable Apps | APIs | AI
London, United Kingdom - 10:42 am local time
With 8+ years of experience, I specialize in backend-heavy systems where performance, reliability, and scalability actually matter, especially in payments and high-traffic environments.
Whether you need to integrate payments, improve system performance, or build a multi-tenant SaaS product, I can step in and deliver production-ready solutions.
What I can help you with:
💳 Payment Systems & Integrations
- Stripe, Checkout .com, PayPal, Skrill, Applepay, Googlepay
- Subscriptions, billing logic, refunds
- Webhooks, retries, and failure handling
- Improving payment success rates & reliability
🏗 SaaS & Multi-Tenant Architecture
- Multi-tenant system design (scalable & secure)
- Subscription-based platforms
- Clean, maintainable backend architecture
🔗 API Development & Integrations
- High-performance REST APIs (Node.js, C#, PHP)
- Third-party integrations (payments, SaaS, fintech)
- Fixing slow or unreliable APIs
⚡ Performance & Scalability
- Reduce latency and improve system throughput
- Optimize high-traffic systems
- Cloud-native architectures (AWS, Docker, Kubernetes)
📱 Full Stack Development
- Frontend: React / Next.js
- Mobile: Flutter
- Backend-focused, but capable end-to-end delivery
Selected impact:
- Built a multi-tenant SaaS platform adopted by multiple UK businesses
- Reduced API latency by 30% for a gaming platform
- Improved payment processing for a system handling 600K+ monthly transactions
- Led system migration for a platform with 250K+ monthly users
How I work:
- Strong focus on clean architecture and long-term maintainability
- Comfortable with existing/legacy systems
- Async-friendly communication
- Minimal meetings, maximum delivery
Offers
- I will audit and fix your payment system (Stripe/Checkout/PayPal)
- I will implement subscription billing with Stripe or Checkout .com
- I will design/build your multi-tenant SaaS backend
- I will integrate any third-party API into your system
- Payment system migration
- Review your payment or SaaS architecture and suggest improvements
- Implement mobile payments (Stripe/Apple Pay/Google Pay) in Flutter
- Fix webhook issues
- SaaS billing system
- API integration help
If you need someone who understands both payments and scalable systems, feel free to reach out.
Steps for completing your project
After purchasing the project, send requirements so Ertugrul Baki can start the project.
Delivery time starts when Ertugrul Baki receives requirements from you.
Ertugrul Baki works on your project following the steps below.
Revisions may occur after the delivery date.
Understand Requirements
Review your needs, payment flow, and technical setup to plan the integration
Payment Gateway Integration
Integrate Stripe or PayPal APIs into your backend with secure handling