Fix Hostinger API Errors

I’m running a project on Hostinger’s Horizon platform and every API call is currently failing with a “data retrieval error.” The issue isn’t limited to a single route—every endpoint I test returns the same response. All requests are authenticated with an API key, so it’s not OAuth or a basic-auth problem.

Here’s what I need:

• Diagnose why the Horizon API refuses to return data when an API-key header is supplied.
• Implement and test a clean fix—whether that’s correcting headers, adjusting CORS, rewriting routes, or updating server-side settings—until each endpoint delivers the expected JSON response.
• Provide a concise report of the root cause and the steps you took so I can reproduce or roll back if needed.

You’ll get full access to the Hostinger dashboard, current codebase, and any relevant logs. Once you confirm all endpoints work reliably in both test and production, we’re done.