Retell AI Install Auth Overview Install the Retell AI SDK and configure API key authentication for building voice agents. Prerequisites - Retell AI account at retellai.com - API key from the Retell AI dashboard - Node.js 18+ or Python 3.9+ Instructions Step 1: Install SDK Step 2: Configure Environment Step 3: Initialize Client (Node.js) Step 4: Initialize Client (Python) Output - installed - API key configured - Connection verified with agent listing Error Handling | Error | Cause | Solution | |-------|-------|----------| | | Invalid API key | Verify key in Retell Dashboard | | | SDK not inst…