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ROOT CAUSE (Zen Debug Investigation): The API_BASE_URL constant was being evaluated when the module loaded, BEFORE window.env was populated by env-config.js. This caused the app to permanently use the fallback localhost:3001 instead of reading the production URL from the .env file. TIMING ISSUE: 1. Browser loads index.html 2. env-config.js loads (creates window.env) 3. main.tsx loads as ES module (DEFERRED) 4. Module imports checkoutClient → const API_BASE_URL executes 5. window.env NOT READY YET → falls back to localhost:3001 6. API_BASE_URL locked to wrong value forever THE FIX: Changed from module-level constants to request-time lazy evaluation. Now getApiBaseUrl() is called WHEN THE API REQUEST HAPPENS, not when the module loads. At that point window.env is guaranteed to exist. FILES CHANGED: - src/api/checkoutClient.ts: * Removed constant API_BASE_URL * All 3 functions now call getApiBaseUrl() at request time * Added logging to show which URL is being used - src/api/aisClient.ts: * Removed constant API_KEY * Added getApiKey() function with lazy evaluation * Same pattern for consistency and future-proofing This fixes: "FetchEvent for http://localhost:3001 resulted in network error" Now uses: https://puffinoffset.com/api (from .env file) 🔒 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>