GA - coupon_applied

// Fire this dataLayer event when the user successfully applies a coupon.

window.dataLayer = window.dataLayer || [];
  window.dataLayer.push({
   'event': 'coupon_applied',
   'process': 'rnw',  // Variable value. ID/name of the selected process.
   'coupon': 'coupon name'  // Variable value. Name of the coupon.
});