app.js

const app = express(); 
const log = message => console.log(message); 

const emailService = new EmailService(logger); 

app.get('/', (request, response) => { 
  const requestId = uuid(); 
  log(`[${requestId}] Start processing`); 
  
  await emailService.notify(request.body.emails, requestId); 
  response.writeHead(200); 
});