{"message":"API Server is running!","status":"active","timestamp":"2026-06-19T19:33:29.756Z","endpoints":["GET /health - Health check","GET /api/payments - Get all payments","GET /api/centers - Get all medical centers","GET /api/clients - Get all clients","GET /api/materials - Get all materials","GET /api/doctors - Get all doctors","GET /api/services - Get all services"]}