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Call Web API to Update Custom Field on Post Save in WordPress

Solution:

You can try the pre_post_update action to process your API data before the save, this will work only for updating posts, not creating.

function do_something_before_updating_post($post_id, $post_data) {
 // Run your API
}

add_action('pre_post_update', 'do_something_before_updating_post', 10, 2);