title: How to override JS Resource in Magento 2 Checkout
body: <p>I am trying to override JS Resource in Magento 2 Checkout. Precisely I want to add code to funktion placeOrder in Magento_Checkout\js\view\payment\default.js</p>
  
  <p>I have tried 'mixins' feature but did not make it work. I am stucked here due to lack of good instruction for Mangeto 2.</p>
  
  <p>Any idea will be helpful!</p>