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Fiverr Pro
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I will integrate rest API, graphql API, sdk, webhook, stripe, openai, twilio API
Esther D
About this gig
Need to connect your application with a REST API, GraphQL API, SDK, or Webhook? I provide reliable backend API integrations that are secure, scalable, and production-ready.
I specialize in integrating third-party APIs for web applications, mobile apps, SaaS platforms, AI tools, and eCommerce solutions. Whether you need a new integration, troubleshooting, or an existing API fixed, I'll deliver clean, maintainable backend code that works seamlessly with your application.
Services I Offer:
- REST API Integration
- GraphQL API Integration
- Third-Party API Integration
- SDK Integration
- Webhook Setup & Debugging
- API Authentication (OAuth, JWT, API Keys)
- Stripe API Integration
- OpenAI API Integration
- Twilio API Integration
- PayPal API Integration
- Payment Gateway Integration
- Backend Bug Fixes
- API Error Resolution
- JSON & XML Data Handling
- API Testing & Documentation
I work with Node.js, Express.js, Next.js, TypeScript, JavaScript, Supabase, Firebase, PostgreSQL, MongoDB, and modern backend technologies to ensure fast, secure, and reliable integrations.
Please contact me before placing your order so we can discuss your API requirements and ensure the best solution for your project.
Get to know Esther D
Esther D
AI Developer,AI Agent Expert,Full Stack AI Engineer,OpenAI,Claude,SaaS,APIs,MCP
- FromItaly
- Member sinceJul 2026
- Avg. response time1 hour
Languages
Italian, English, German, French
Hello, I'm a Full Stack AI Developer passionate about building intelligent, scalable, and production-ready AI solutions. I specialize in AI agents, AI automation, LLM applications, custom chatbots, MCP servers, OpenAI, Claude, Gemini, LangChain, RAG systems, vector databases, n8n workflows, API integrations, SaaS MVPs, AI-powered web applications, React, Next.js, Node.js, Python, Supabase, Firebase, PostgreSQL, AWS, Vercel, Stripe integrations, workflow automation, prompt engineering, AI assistants, business automation, bug fixing, deployment, optimization, and secure backend architecture.
Other Software Development Services I Offer
FAQ
Can you integrate any third-party API into my application?
Yes. I can integrate REST APIs, GraphQL APIs, SDKs, and Webhooks into your web or mobile application. I ensure secure authentication, proper error handling, accurate data exchange, and clean backend code that is easy to maintain and scale.
Which APIs do you work with?
I work with Stripe, OpenAI, Twilio, PayPal, Google, Shopify, Firebase, Supabase, AWS, Discord, Slack, and many other third-party APIs. If your provider offers an API or SDK, I can integrate it into your application.
Can you fix an API that isn't working correctly?
Absolutely. I troubleshoot API errors, authentication failures, Webhook issues, invalid responses, timeout errors, rate limits, and integration bugs. I'll identify the root cause and deliver a reliable, production-ready solution.
Do you support REST API and GraphQL API integration?
Yes. I build and integrate both REST and GraphQL APIs for web, mobile, SaaS, AI, and eCommerce applications. I'll ensure your application communicates efficiently while following industry best practices for security and performance.
Can you set up Webhooks and SDK integrations?
Yes. I configure Webhooks for real-time events and integrate SDKs from third-party services into your backend. I also verify payloads, secure endpoints, and thoroughly test the integration before delivery.
Which backend technologies do you use?
I primarily work with Node.js, Express.js, TypeScript, JavaScript, Next.js, Supabase, Firebase, PostgreSQL, and MongoDB. I'll choose the best approach based on your existing tech stack and project requirements.
Will my API integration be secure?
Yes. I follow backend security best practices, including API key protection, OAuth, JWT authentication, request validation, secure Webhook verification, and proper error handling to keep your application and data protected.
Can you integrate payment gateways like Stripe or PayPal?
Yes. I integrate payment gateways including Stripe and PayPal with secure checkout flows, subscriptions, Webhooks, payment verification, and backend processing to ensure reliable and secure transactions.
What do you need before starting my project?
Please provide your project details, API documentation, SDK files if available, repository or source code, and any API credentials or access required. If you're unsure, I'll guide you through everything needed before development begins.
Do you provide support after the integration is complete?
Yes. I provide post-delivery support to verify the integration, answer implementation questions, and resolve any issues directly related to the completed work, ensuring your API functions smoothly after deployment.
