PaySys / TatraPay

		return $this;

	}

	public function setKey(string $originalKey) : Configuration

	{

		$key = $this->getNormalizedKey($originalKey);

		if (!Validator::isKey($key))

			throw new \PaySys\PaySys\ConfigurationException(sprintf("Key '%s' is invalid. Must have 64 byte standard string or 128 byte in hexadecimal format.", $originalKey));

		$this->key = $key;

		return $this;

	}

	public function setLang(string $originalLang) : Configuration

	{

		return $this;

	}

	public function setLang(string $originalLang) : Configuration

	{

		$lang = strtolower($originalLang);

		if (!Validator::isLang($lang))

			throw new \PaySys\PaySys\ConfigurationException(sprintf("Lang '%s' is not supported.", $originalLang));

		$this->lang = $lang;

		return $this;

	}

	public function setRem(string $rem) : Configuration

	{