Filters the URL PMPro redirects wp-login.php?action=register to. Returning false or an empty string will result in no redirect from the register page.
pmpro_login_redirect_url
Filters the URL to redirect to when logging in. Passes the URL, request, WP_User object.
pmpro_login_redirect
Controls whether or not to redirect the default Registration page to the PMPro Levels page. Passing false will not redirect.