Delete Expired Coupons Automatically

functions.php

<?php
// Delete Expired Coupons that have an expiration date set and are not from AutomateWoo
add_action('delete_expired_coupons_hook', 'delete_expired_coupons_action');
function delete_expired_coupons_action() {
	$query_args = [
		'fields'         => 'ids',
		'post_type'      => 'shop_coupon',
		'post_status'    => 'any',
		'posts_per_page' => -1,
		'orderby'        => 'date',
		'order'          => 'ASC',
		'no_found_rows'  => true,
		'meta_query'     => [
			[
				'key'     => 'date_expires',
				'value'   => '',
				'compare' => '!='
			],
			[
				'key'   => '_is_aw_coupon',
				'value' => false,
			],
			[
				'key'     => 'date_expires',
				'value'   => current_time( 'timestamp' ),
				'compare' => '<',
			],
		],
	];

	$query = new \WP_Query($query_args);
	$coupons = $query->posts;

	if (!empty($coupons)) {
		foreach ($coupons as $coupon_id) {
			wp_trash_post($coupon_id);
		}
	}
}

// Schedule the Deletion (If Not Already Scheduled)
add_action('init', 'schedule_delete_expired_coupons');
function schedule_delete_expired_coupons() {
	if (!wp_next_scheduled('delete_expired_coupons_hook')) {
		wp_schedule_event(time(), 'daily', 'delete_expired_coupons_hook');
	}
}

// Manual Deletion Button in Marketing > Coupons
add_action('restrict_manage_posts', 'custom_add_delete_expired_button', 99);
function custom_add_delete_expired_button() {
	global $typenow;
	if ('shop_coupon' === $typenow) {
		?>
		<form method="post" style="display:inline;">
			<input type="hidden" name="custom_action" value="delete_expired_coupons">
			<?php wp_nonce_field('custom_delete_expired_coupons', 'custom_delete_nonce'); ?>
			<input type="submit" class="button" value="Delete Expired Coupons" onclick="return confirm('Are you sure you want to delete all expired coupons?');" />
		</form>
		<?php
		// Display a notice if expired coupons were deleted.
		if (isset($_REQUEST['custom_deleted']) && $_REQUEST['custom_deleted'] === 'true') {
			echo '<div class="updated"><p>Expired coupons deleted successfully.</p></div>';
		}
	}
}

// Redirect with a message after deletion.
add_action('admin_init', 'custom_delete_expired_coupons');
function custom_delete_expired_coupons() {
	if (isset($_REQUEST['custom_action']) && $_REQUEST['custom_action'] === 'delete_expired_coupons' && check_admin_referer('custom_delete_expired_coupons', 'custom_delete_nonce')) {
		delete_expired_coupons_action();
		
		wp_redirect(add_query_arg(['custom_deleted' => 'true'], admin_url('edit.php?post_type=shop_coupon')));
		exit;
	}
}

Change "expiry_date" to "date_expires"