clear_flow.js

function placeOrder(order) {
  saveOrderToDatabase(order);
  const invoiceFile = generateOrderInvoiceFile(order);
  sendInvoiceEmail(order, invoiceFile);
}

function saveOrderToDatabase(order){
// The implementation details of how to save an order to the database
}

function generateOrderInvoiceFile(order) {
// The implementation details of how to generate an invoice file from an order
}

function sendInvoiceEmail(order, invoiceFile) {
// The implementation details of how to send an invoice email
}