PayPal\Api\CreditCardToken::setCreditCardId PHP Method

    public function setCreditCardId($credit_card_id)
    {
        $this->credit_card_id = $credit_card_id;
        return $this;
    }

 public static function createCreditCardToken()
 {
     $ccToken = new CreditCardToken();
     $ccToken->setPayerId(self::$payerId);
     $ccToken->setCreditCardId(self::$creditCardId);
     return $ccToken;
 }