I found out that I can’t use the plugin payment gateway(I can but then the theme do not work with WooCommerce coupon), we have PayEx https://github.com/PayEx/PayEx.WooCommerce .But the thing is when we use a other themes or a clean version of WordPress and WooCommerce it works.
Site URL: hidden Theme version: 4.7.1 WooCommerce version: 3.1.2
Content is visible for topic creator and support staff only.
So is there a solution on this problem?. Can’t find anything that is blocking COUPON part in the code from PayEx. The only code I can get is a “display: none” in code, but where it comes from i have no clue, so there has to be something in the COUPON part that is blocking the code, theme or some setting that is effecting.
At that place should be the link http://prntscr.com/gtmpzt and once you click that link coupon form appears but you have hidden it using custom css and child theme. So, either you need to remove that code and use additional styles to show form without clicking on that link.
So, as you can see it’s not the plugin compatibility issue. It’s your custom styles.