function remove_wpf_actions() {

    if ( ! function_exists( 'wp_fusion' ) ) {
        return;
    }

    remove_action( 'lifterlms_order_status_completed', array( wp_fusion_ecommerce()->integrations->lifterlms, 'access_plan_purchased' ), 10, 2 );

}

add_action( 'plugins_loaded', 'remove_wpf_actions' );