<?php

defined( 'ABSPATH' ) or exit;

$options = get_option( 'mc4wp_integrations', array() );

if( ! empty( $options['woocommerce'] ) && ! empty( $options['woocommerce']['position'] ) ) {
    $options['woocommerce']['position'] = sprintf( 'checkout_%s', $options['woocommerce']['position'] );
}

update_option( 'mc4wp_integrations', $options );