以下是您可以做的：

当帖子的状态从future 到publish, 当预定时间到达时就会发生。然后，将其状态更改为draft，并向API发出请求。如果API回复了，您可以存储回复的内容并发布帖子。如果没有，请再次安排。

function api_request_transition( $new_status, $old_status, $post ) {
    // Let\'s check for draft too, since we will set the status to draft if the API doesn\'t reply
    if ( ($old_status ==\'future\' || $old_status ==\'draft\') && $new_status ==\'publish\' ) {
        // Set the status to draft for now
        $current_post = array(
          \'ID\'           => $post->ID,
          \'post_title\'   => $post->post_title,
          \'post_status\'  => \'draft\',
        );
        wp_update_post( $current_post );
        // Get the content from the API
        $api_data = file_get_contents(\'URL HERE\');
        // If the content is valid, add it to the post and publish it
        if ($api_data) {
            $my_post = array(
              \'ID\'           => $post->ID,
              \'post_title\'   => $post->post_title,
              \'post_content\' => $api_data,
              \'post_status\'  => \'publish\',
            );
            wp_update_post( $my_post );
         // If the API didn\'t answer, run this process again in 5 minutes
        } else {
            // Pass the data to the cron job
            $args = ( 
                    $new_status, 
                    $old_status, 
                    $post ,
                );
            // Schedule this again for 5 minutes later
            wp_schedule_single_event(time() + 300 , \'api_repeat_request\', $args);
        }
    }
}
add_action( \'transition_post_status\', \'api_request_transition\', 10, 3 );
add_action( \'api_repeat_request\', \'api_request_transition\',1 ,3 );