function wc_clear_cart_after_payment() {
	global $wp;

	if ( ! empty( $wp->query_vars['order-received'] ) ) {

		$order_id  = absint( $wp->query_vars['order-received'] );
		$order_key = isset( $_GET['key'] ) ? wc_clean( wp_unslash( $_GET['key'] ) ) : ''; // WPCS: input var ok, CSRF ok.

		if ( $order_id > 0 ) {
			$order = wc_get_order( $order_id );

			if ( $order && hash_equals( $order->get_order_key(), $order_key ) ) {
				WC()->cart->empty_cart();
			}
		}
	}

	if ( WC()->session->order_awaiting_payment > 0 ) {
		$order = wc_get_order( WC()->session->order_awaiting_payment );

		if ( $order && $order->get_id() > 0 ) {
			// If the order has not failed, or is not pending, the order must have gone through.
			if ( ! $order->has_status( array( 'failed', 'pending', 'cancelled' ) ) ) {
				WC()->cart->empty_cart();
			}
		}
	}
}