Snippet to remove coupon from WooCommerce cart

remove-coupon.php

<?php

add_action( 'woocommerce_before_calculate_totals', 'remove_matched_coupons' );
function remove_matched_coupons() {
    $coupon_code = 'renewal20'; // Replace with your own coupon code
    if ( ! WC()->cart->has_discount( $coupon_code ) ) return;
    
		// REMOVE COUPON WITHOUT ANY CONDITIONS
		WC()->cart->remove_coupon( $coupon_code );
		wc_clear_notices();
		wc_add_notice( __("Sorry, it seems this coupon is not yours.","woocommerce"), 'notice');

		// REMOVE COUPON IF PRODUCT ID IS IN CART
		foreach ( WC()->cart->get_cart() as $cart_item_key => $cart_item ) {
			$excludedProducts = array( 186, 187, 188 ); // Replace with your own product ids

			if ( in_array( $cart_item['product_id'], $excludedProducts ) ) {   
				WC()->cart->remove_coupon( $coupon_code );
				wc_clear_notices();
				wc_add_notice( __("Sorry, it seems this coupon is not yours.","woocommerce"), 'notice');
			}
    }
	
		// REMOVE COUPON IF CART TOTAL IS LESS THAN 30
		if ( WC()->cart->subtotal < 30 ) ) { // Replace with your own total 
			WC()->cart->remove_coupon( $coupon_code );
			wc_clear_notices();
			wc_add_notice( __("Sorry, your minimum spend has to be 30 for you to use this coupon.","woocommerce"), 'notice');
		}
}

?>