Ultimate Member v3: Custom redirect after Lost Password form submission

functions.php

/**
 * Use real URLs instead of {user_exists_url}, {user_doesnot_exist_url} placeholders.
 */
function um_012722_redirect_after_sending_password_reset( $user_id = null ) {
	if ( is_numeric( $user_id ) ) {
		// user exists
		wp_redirect( '{user_exists_url}' ); 
	} else {
		wp_redirect( '{user_doesnot_exist_url}' ); 
	}
	exit;
}
add_action( 'um_after_send_lostpassword_link', "um_012722_redirect_after_sending_password_reset", 10, 1 );