Third-Party API Integration Not Working in Base44
You've configured a third-party API integration in your Base44 app (such as connecting to Stripe, SendGrid, Airtable, or a custom REST API), but the integration fails. Requests return errors, data doesn't sync, or the connection times out.
API integrations are critical for extending Base44 apps with external services. A broken integration can prevent payment processing, email sending, data synchronization, or any other external functionality your app depends on.
The issue may manifest differently: some API calls succeed while others fail, or the integration works from the editor but fails in the published app.
Error Messages You Might See
Common Causes
- API keys or authentication tokens are incorrect, expired, or not set in the production environment
- CORS (Cross-Origin Resource Sharing) policies block client-side API calls from the published app's domain
- The request format (headers, body, content type) doesn't match what the third-party API expects
- The API endpoint URL is wrong or the API version has been deprecated
- Rate limits on the third-party API are being exceeded
How to Fix It
First, verify the API credentials are correct and set in the production environment. Test the API call directly using a tool like Postman or curl to confirm the credentials and endpoint work outside of Base44.
If the call works in Postman but not in Base44, the issue is likely CORS. Client-side API calls from a browser are subject to CORS restrictions. The call may need to be routed through a server-side function.
For integrations with complex authentication (OAuth, signed requests) or APIs that require specific header configurations, a developer can set up the integration to work reliably in the production environment.
Real developers can help you.
Prakash Prajapati
I’m a Senior Python Developer specializing in building secure, scalable, and highly available systems. I work primarily with Python, Django, FastAPI, Docker, PostgreSQL, and modern AI tooling such as PydanticAI, focusing on clean architecture, strong design principles, and reliable DevOps practices. I enjoy solving complex engineering problems and designing systems that are maintainable, resilient, and built to scale.
Daniel Vázquez
Software Engineer with over 10 years of experience on Startups, Government, big tech industry & consulting.
Matthew Butler
Systems Development Engineer @ Amazon Web Services
Matt Butler
Software Engineer @ AWS
Richard McSorley
Full-Stack Software Engineer with 8+ years building high-performance applications for enterprise clients. Shipped production systems at Walmart (4,000+ stores), Cigna (20M+ users), and Arkansas Blue Cross. 5 patents in retail/supply chain tech. Currently focused on AI integrations, automation tools, and TypeScript-first architectures.
Simon A.
I'm a backend developer building APIs, emulators, and interactive game systems. Professionally, I've developed Java/Spring reporting solutions, managed relational and NoSQL databases, and implemented CI/CD workflows.
Krishna Sai Kuncha
Experienced Professional Full stack Developer with 8+ years of experience across react, python, js, ts, golang and react-native. Developed inhouse websearch tooling for AI before websearch was solved : )
Yovel Cohen
I got a lot of experience in building Long-horizon AI Agents in production, Backend apps that scale to millions of users and frontend knowledge as well.
Jared Hasson
Full time lead founding dev at a cyber security saas startup, with 10 yoe and a bachelor's in CS. Building & debugging software products is what I've spent my time on for forever
Anthony Akpan
Developer with 8 years of experience building softwares fro startups
You don't need to be technical. Just describe what's wrong and a verified developer will handle the rest.
Get HelpFrequently Asked Questions
Why does my API integration work in Base44 preview but not when published?
The most common cause is CORS restrictions or missing environment variables in production. Client-side API calls from a different domain may be blocked by the API's CORS policy.
How do I fix CORS errors in Base44?
CORS blocks browser-to-API calls from different domains. Route your API calls through a server-side function instead of making them directly from the client-side. A developer can help set this up.