Multi transfers route handler with reading and parsing the file

config.js

// mirage/config.js - Mocking with factories and the data from the request file 

this.post('/multi_transfers', async function (schema, request) {
  let file = request.requestBody.get('multi_transfer[file][file]');
  let fileContents = await readFile(file);
  let transferData = parseCSV(fileContents);
  
  let multiTransfer = server.create('multi-transfer', {
    status: 'pending',
    ...transferData,
  });

  return multiTransfer;
});