{"message":"QR Code Generator API","endpoints":{"POST /qr/generate":"Generate single QR code","POST /qr/minimal":"Generate ultra-minimal QR code (no margin, L error level)","POST /qr/bulk":"Generate multiple QR codes","GET /qr/list":"List all QR codes","GET /qr/:id":"Get specific QR code","GET /qr/:id/download":"Download QR code file","DELETE /qr/:id":"Delete QR code","GET /health":"Health check and API status"}}