public function getSignatureLite(): string
	{
		$data = [
			'merchantId'   => $this->getMerchantConfig()->merchantId,
			'accountId'    => $this->getMerchantConfig()->accountId,
			'merchantData' => $this->getMerchantData(),
			'password'     => $this->getMerchantConfig()->password,
		];

		return md5(
			http_build_query(
				array_filter($data)
			)
		);
	}