{"message":"Invoice API Server","version":"1.0.0","endpoints":{"customers":{"GET /api/customers":"Get all customers","GET /api/customers/:id":"Get customer by ID","GET /api/customers/phone/:phone":"Get customer by phone","POST /api/customers":"Create new customer"},"invoices":{"GET /api/invoices":"Get all invoices","GET /api/invoices/:id":"Get invoice by ID","POST /api/invoices":"Create new invoice"}}}