add_filter(
   'mastodon_api_status',
    function(
        $ret,
        $ID,
        array $array = null
    ) {
        // Your code here.
        return $ret;
    },
    10,
    2
);

apply_filters( 'mastodon_api_status', null, $last_status->ID )

apply_filters( 'mastodon_api_status', null, $post_id )

apply_filters( 'mastodon_api_status', null, $post->ID, array() )