WooCommerce - hide the coupon form everywhere, but leave coupons enabled for use with plugins like Smart Coupons and URL Coupons

wc-hide-coupons.php

<?php

// hide coupon form everywhere
function hide_coupon_field( $enabled ) {

	if ( is_cart() || is_checkout() ) {
		$enabled = false;
	}
	
	return $enabled;
}
add_filter( 'woocommerce_coupons_enabled', 'hide_coupon_field' );