title: Magento2 apply coupon code button at checkout payment step after refresh
body: <p>I am using Magento2 EE 2.1.3.</p>
  
  <p>In it when i apply the coupon code at checkout page at payment step it works perfect and button text change from 'Apply Discount' to 'Cancel Coupon'. But when i refresh the page button again change to 'Apply Discount'.</p>