add_action( 'propertyhive_property_imported_blm', 'amend_property_slug', 10, 2);
function amend_property_slug( $post_id, $property )
{
    $slug = 'property-details-' . $property['AGENT_REF'];

    $my_post = array(
        'ID'             => $post_id,
        'post_name'      => sanitize_title($slug),
    );

    // Update the post into the database
    wp_update_post( $my_post );
}