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

apply_filters( 'mastodon_api_account', null, $friend_user->ID, null, $post_id )

apply_filters( 'mastodon_api_account', null, $attributed_to_url )

apply_filters( 'mastodon_api_account', null, $user_feed->get_friend_user()->ID )

apply_filters( 'mastodon_api_account', null, $account_id )

apply_filters( 'mastodon_api_account', null, $user_id, $request, null )