Hook um_user_login

um_user_login.php

<?php

/**
 * Hook: um_user_login
 *
 * Type: action
 *
 * Description: Fires after the Login Form successful submit.
 * Used in the core for login and redirect after the Login Form validation.
 *
 * @example https://github.com/ultimatemember/ultimatemember/blob/master/includes/core/um-actions-login.php#L303
 * @link    https://docs.ultimatemember.com/article/1298-umuserlogin
 *
 * @package    um\core
 * @see        um_submit_form_login()
 * @see        um_user_login()
 * @since      2.0
 * @deprecated since version 3.0
 *
 * @param array $args Form data.
 */
function my_user_login( $args ) {
	// your code here.
}
add_action( 'um_user_login', 'my_user_login', 10, 1 );