public function subtitle($subtitle)
    {
        if (mb_strlen($subtitle) > 80) {
            throw CouldNotCreateCard::subtitleLimitExceeded($subtitle);
        }

        $this->payload['subtitle'] = $subtitle;

        return $this;
    }
public function subtitle($subtitle)
    {
        if (mb_strlen($subtitle) > 80) {
            throw CouldNotCreateCard::subtitleLimitExceeded($subtitle);
        }

        $this->payload['subtitle'] = $subtitle;

        return $this;
    }
public function subtitle ( $ subtitle ) { if ( mb_strlen ( $ subtitle ) > 80 ) { throw CouldNotCreateCard :: subtitleLimitExceeded ( $ subtitle ) ; } $ this -> payload [ 'subtitle' ] = $ subtitle ; return $ this ; }
Set Card Subtitle.

@param $subtitle

@throws CouldNotCreateCard
@return $this
Set Card Subtitle .