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var pc = require('postman-collection');
// Empty collection
var myCollection = new pc.Collection({ /* name, etc */});
// Empty item
var myItem = new pc.Item();myItem.request = new pc.Request(
  {  url: 'http://example.com/something', 
  method: 'POST'});myItem.request.headers.add({ key: 'ClientId', value: 'whatever' 
  }); 
  // same for other headers
  // Add the item to our collection
  myCollection.items.add(myItem);
  // get the JSONified collection
  plainCollection = myCollection.toJSON();