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Fiverr Pro
English
$
USD
I will fix or develop rest api, webhook, javascript, nodejs, json,XML, oauth, soap, php
David Api
About this gig
Hi there! I specialize in REST API development, API integration, webhook automation, and fixing complex API issues using Node.js, JavaScript, and PHP.
Whether you're dealing with JSON/XML errors, OAuth authentication issues, or SOAP API integration, I will deliver a secure, scalable, and reliable solution.
What I can do for you:
- Fix broken API integrations (REST, SOAP, Webhooks)
- Build custom REST APIs from scratch
- Integrate third-party APIs (Stripe, Shopify, CRM, etc.)
- Handle JSON & XML data parsing and transformation
- OAuth 2.0 authentication setup (secure connections)
- Webhook development for real-time data sync
- Node.js / PHP backend API development
- Database integration (MySQL, MongoDB, Firebase)
- Error handling, logging & performance optimization
- Automation workflows & background jobs
Why choose me?
- Clean, scalable & production-ready code
- Fast communication & clear updates
- Focus on performance, security & reliability
- Built for real business use (not just code)
Send me a message before ordering so we can discuss your project and get it done right.
Get to know David Api
David Api
API Backend Development Expert
- FromUnited Kingdom
- Member sinceApr 2026
Languages
English, German, Spanish, French
Hi, I'm David, an API and Backend Development Expert.
I help businesses scale by removing manual tasks through smart, clean, and sharp API integrations. Focusing purely on core technical solutions, I am highly experienced in building robust REST API, Webhook, and OAuth connections that "just work." Let's automate your data flow and technical backend for success today!
Other Software Development Services I Offer
FAQ
1. Can David migrate my existing website or funnel to GoHighLevel?
Yes! I can seamlessly migrate your pages from ClickFunnels, WordPress, Wix, or Kajabi into GoHighLevel. I ensure that the design stays consistent while optimizing the backend for faster loading and better mobile responsiveness.
2. Do I need to have my own GoHighLevel account?
Yes, you will need an active GoHighLevel subscription (Starter, CRM, or SaaS plan). If you haven't signed up yet, message me and I can provide a link for a 14-day free trial and advise you on which plan fits your business.
3. Will you help me with A2P 10DLC (SMS) Registration?
Absolutely. SMS compliance is critical in 2026. I will guide you through the Brand and Campaign registration process inside the Trust Center to ensure your messages actually get delivered and your account stays in good standing.
4. Can you set up the new GoHighLevel AI Voice or Chat Agents?
Yes, I specialize in GHL AI Integration. I can set up conversational AI bots to handle your lead qualification, answer FAQs 24/7, and book appointments directly into your calendar without any human intervention.
5. Are your funnels and websites mobile-friendly?
100%. More than 70% of traffic in 2026 comes from mobile devices. Every GHL sales funnel and website I build is fully responsive, meaning it will look and perform perfectly on smartphones, tablets, and desktops.
6. Does David provide the copy (text) and images for the pages?
I typically use the content you provide. However, if you don't have copy ready, I can use high-quality placeholder text or assist with basic AI-optimized copy as an extra service. For images, I use professional stock photos relevant to your niche
