WooCommerce supports the use of coupons to enable discounting of products.
The option to input a coupon code is presented on the basket page. Here, following the list of products, there’s a text box and button to add the coupon code.
But what if you don’t wish to provide the option to discount your products?
WooCommerce allows coupons to be disabled via the settings menu – no need to add custom over-writes in your functions.php file.
From the left hand black menu click on the WooCommerce menu entry and select Settings.
Stay on the default General tab. scroll down to the option Enable coupons.
To disable coupons untick the checkbox titled Enable the use of coupon codes.
Disabling the use of coupon codes in WooCommerce is a simple option, which can be done with no programming knowledge.
