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I will integrate rest API, third party API, webhook and payment API
William SAM
About this gig
Need to connect your website, web application, or mobile app with an external service?
I will integrate REST APIs, third-party APIs, webhooks, payment APIs, and other external services into your existing application.
Whether you need to connect a payment provider, CRM, database, business platform, authentication provider, or another API-based service, I can help connect the systems and handle the required data flow.
What I Can Integrate:
- REST APIs
- Third-party APIs
- Payment APIs
- Webhooks
- Authentication APIs
- CRM APIs
- Shipping and logistics APIs
- Maps and location APIs
- Social media APIs
- AI and LLM APIs
- E-commerce APIs
- Custom business APIs
API Integration Services:
- API authentication and authorization
- REST API integration
- Third-party service integration
- Webhook setup
- JSON data handling
- Database integration
- Data synchronization
- Request and response handling
- Error handling
- API testing
- Existing API troubleshooting
- Payment API integration
I can integrate APIs into existing:
- Websites
- Web apps
- SaaS platforms
- Mobile applications
- E-commerce systems
- Business management systems
- Dashboards
- Custom software
Send me your API documentation or project requirements and let's discuss the integration
Get to know William SAM
William SAM
Full Stack Developer
- FromUnited Kingdom
- Member sinceSep 2026
- Avg. response time1 hour
Languages
English
I’m a Professional Full Stack Developer specializing in UI/UX design, frontend and backend development, API integration, database architecture, authentication, cloud deployment & the development of modern, secure and high-performing web and mobile applications using React, Node.js, Python, FastAPI, Flutter, MongoDB, PostgreSQL, Firebase etc & other modern technologies to build custom digital solutions including SaaS platforms, eCommerce websites, business management systems, marketplaces, dashboards & API-driven platforms for businesses, startups and entrepreneurs across different industries.
FAQ
What is API integration?
API integration connects two or more software systems so they can exchange data and communicate with each other.
Can you integrate any third-party API?
I can work with APIs that provide appropriate documentation, authentication methods, and access required for integration. The API's capabilities and restrictions will determine what can be implemented
Can you integrate an API into my existing application?
Yes. I can work with an existing website, web application, SaaS platform, or mobile application after reviewing the project and API requirements.
Do I need to provide API access?
Yes. You will need to provide the API documentation, credentials, keys, or other required access where applicable.
Can you work with APIs that require authentication?
Yes. I can implement supported authentication methods such as API keys, bearer tokens, OAuth, and other documented authentication methods.
Can you fix an existing API integration?
Yes. I can review and troubleshoot existing API integrations when the relevant project files, documentation, and access are available.
Can you integrate APIs into mobile apps?
Yes. APIs can be integrated into supported Android, iOS, or cross-platform applications.
What do you need before placing an order?
Please provide your API documentation, application details, required functionality, access credentials where necessary, and any relevant project files.
