如何从其他自定义帖子类型获得的自定义帖子类型更新post_meta？

Question

我从另一个自定义帖子类型成功获取了名为“ rwp_user_score”的元值，并将其保存为名为$ meta_rwp_user_score的变量。现在，我想每次通过自定义帖子类型更新值时都更新该元值。到目前为止的代码：

<?php
// I'm here in the template for "provider services" and setup some variables.
// $provider_id saves the ID from my custom post type called "provider".
$provider_id = get_field('provider_id');

// $postid saves the ID from my current post-type called "provider services".
$postid = get_the_ID();

// look for that value from cpt provider and save is as a variable
$meta_rwp_user_score=get_post_meta(($provider_id),'rwp_user_score',true);

// now update that value. Before I used add_post_meta that works. But as you know, that doesn't update it like I want. How I update it correctly? So?
update_post_meta( ($postid), 'meta_rwp_user_score', $meta_rwp_user_score, true );
?>