/**
 * @param string $codeVerifier Code verifier
 * @param string $requestToken Request token
 * @param string $redirectUri Redirect URI
 * @param string $scope Scope (payment.one_time_charge or payment.recurring_charge)
 */
$gp->getOauthAuthorizeUrl($codeVerifier, $requestToken, $redirectUri, $scope);

/**
 * @param string $code Code
 * @param string $redirectUri Redirect URI
 * @param string $codeVerifier Code verifier
 */
$gp->getAccessToken($code, $redirectUri, $codeVerifier);

/**
 * @param string $partnerId Partner ID
 * @param string $partnerSecret Partner Secret
 * @param string $clientId Client ID
 * @param string $clientSecret Client Secret
 * @param string $merchantId Merchant ID
 */
$gp = new GP\OneTimeCharge($partnerId, $partnerSecret, $clientId, $clientSecret, $merchantId);

/**
 * @param string $txId order ID
 * @param string $groupTxId partner transaction ID
 * @param int $amount ​Transaction amount as integer
 * @param string $description description of the charge (optional)
 */
$gp->initCharge($txId, $groupTxId, $amount, $description);

/**
 * @param string $accessToken OAuth access token
 * @param string $partnerTxId partner transaction ID
 */
$gp->completeCharge($accessToken, $partnerTxId);

/**
 * @param string $partnerId Partner ID
 * @param string $partnerSecret Partner Secret
 * @param string $clientId Client ID
 * @param string $clientSecret Client Secret
 * @param string $merchantId Merchant ID
 */
$gp = new GP\Tokenization($partnerId, $partnerSecret, $clientId, $clientSecret, $merchantId);

/**
 * @param string $txId order ID
 */
$gp->bind($txId);

/**
 * @param string $accessToken OAuth access token
 * @param string $txId order ID
 * @param string $groupTxId partner transaction ID
 * @param int $amount ​Transaction amount as integer
 * @param string $description description of the charge (optional)
 */
$gp->charge($accessToken, $txId, $groupTxId, $amount, $description);

/**
 * @param string $accessToken OAuth access token
 * @param string $txId order ID
 */
$gp->unbind($accessToken, $txId);

/**
 * @param string $accessToken OAuth access token
 */
$gp->getWalletInfo($accessToken);

/**
 * @param string $accessToken OAuth access token
 * @param string $txId order ID
 */
$gp->checkChargeStatus($accessToken, $txId);

/**
 * @param string $accessToken OAuth access token
 * @param string $txId order ID
 * @param string $groupTxId partner transaction ID
 * @param string $originTxID original partner transaction ID
 * @param int $amount ​Transaction amount as integer
 * @param string $description description of the charge (optional)
 */
$gp->refund($accessToken, $txId, $groupTxId, $originTxID, $amount, $description);

/**
 * @param string $accessToken OAuth access token
 * @param string $txId order ID
 */
$gp->checkRefundStatus($accessToken, $txId);

/**
 * @param string $partnerId Partner ID
 * @param string $partnerSecret Partner Secret
 * @param string $merchantId Merchant ID
 * @param string $terminalId Terminal ID
 */
$gp = new GP\Pos($partnerId, $partnerSecret, $merchantId, $terminalId);

/**
 * @param string $txId order ID
 * @param int $amount ​Transaction amount as integer
 */
$gp->createMerchantPresentQrCode($txId, $amount);

/**
 * @param string $txId order ID
 * @param int $amount ​Transaction amount as integer
 * @param string $qrCode QR code being scanned
 */
$gp->performConsumerPresentQrCode($txId, $amount, $qrCode);

/**
 * @param string $txId order ID
 */
$gp->qrCodeInquiry($txId);

/**
 * @param string $origTxID Original order ID
 */
$gp->cancelTransaction($origTxID);

/**
 * @param string $txID order ID
 * @param string $origTxID Original order ID
 * @param int $amount ​Transaction amount as integer
 */
$gp->refundTransaction($txID, $origTxID, $amount);

$gp->useProduction();

/**
 * @param string $countryCode Country code (alpha-2)
 */
$gp->setCountryCode($countryCode);

/**
 * @param string $currency Currency
 */
$gp->setCurrency($currency);

/**
 * @param int $length Length
 */
$gp->generateNonce($length);