Remove the coupon field on adding products from specific categories - By WebToffee

functions.php

<?php //Do not copy this line of code
add_filter( 'woocommerce_cart_item_class', function($excisting_class, $cart_item, $cart_item_key ){
	$product = $cart_item['data'];
	$categories = $product->get_category_ids();
	$prefix = "wt_sc_product_category_";
	$categories = array_map(function($element) use ($prefix) {
		return $prefix . $element;
	}, $categories);
	$categories = implode(" ", $categories);
	return $excisting_class . ' ' . $categories;
}, 10, 3 );


add_action( 'wp_footer', function(){
	?>
		<script>
			var restricted_array = [45, 55];
			restricted_array = restricted_array.map(item => 'wt_sc_product_category_' + item);
			function check_category_exist(){
				var found = false;
				jQuery('table.shop_table tr').each(function() {
					for (var i = 0; i < restricted_array.length; i++) {
						if (jQuery(this).hasClass(restricted_array[i])) {
							jQuery('table.cart td.actions .coupon').hide();
							jQuery('.woocommerce-form-coupon-toggle').hide();
							found = true;
							break; 
						}
					}
				});
				if(!found){
					jQuery('.shop_table .actions div.coupon').show();
					jQuery('.woocommerce-form-coupon-toggle').show();
				}
			}
			jQuery(document).ready(function(){
				check_category_exist();
			});
			jQuery( document.body ).on( 'removed_from_cart updated_wc_div', function() {
				check_category_exist();
			});
		</script>
	<?php
} );