How to add and subtract user meta values after post meta update

Basically, I have ditched the function, and now update meta data with a click on a hyperlink.

It fires this code, and does exactly what I wanted.

In case anyone interested:

$current_user = wp_get_current_user();
$current_user_id =  $current_user->ID;
$author_id = get_post_field( 'post_author', $post_id );

$user_coins = get_user_meta( $current_user_id, 'usercoins' , true );
$author_coins = get_user_meta( $author_id, 'usercoins' , true );
$post_coins = get_post_meta( $post_id, 'postcoins', true );

$user_coins_sum = $user_coins - 1;
$author_coins_sum = $author_coins + 1;
$post_coins_sum = $post_coins + 1;

         
                
                update_user_meta( $current_user_id, 'usercoins', $user_coins_sum); 
                update_user_meta( $author_id, 'usercoins', $author_coins_sum); 
                update_post_meta( $post_id, 'postcoins', $post_coins_sum );