<?php
/********************************************
 * PayPal API Module
 *
 * Defines all the global variables and the wrapper functions
 ********************************************/
$PROXY_HOST = '127.0.0.1';
$PROXY_PORT = '808';

$SandboxFlag = $pruebas;

/**
 * PayPal API Credentials
 * Replace <API_USERNAME> with your API Username
 * Replace <API_PASSWORD> with your API Password
 * Replace <API_SIGNATURE> with your Signature
 */
$API_UserName = $paypalUsername;
$API_Password = $paypalPassword;
$API_Signature = $paypalSignature;

// BN Code is only applicable for partners
$sBNCode = "PP-ECWizard";

/**
 * Define the PayPal Redirect URLs.
 * This is the URL that the buyer is first sent to do authorize payment with their paypal account
 * change the URL depending if you are testing on the sandbox or the live PayPal site
 *
 * For the sandbox, the URL is https://www.sandbox.paypal.com/webscr&cmd=_express-checkout&token=
 * For the live site, the URL is https://www.paypal.com/webscr&cmd=_express-checkout&token=
 */

if ($SandboxFlag == true) {
    $API_Endpoint = "https://api-3t.sandbox.paypal.com/nvp";
    $PAYPAL_URL = "https://www.sandbox.paypal.com/webscr?cmd=_express-checkout&token=";
} else {
    $API_Endpoint = "https://api-3t.paypal.com/nvp";
    $PAYPAL_URL = "https://www.paypal.com/cgi-bin/webscr?cmd=_express-checkout&token=";
}

$USE_PROXY = false;
$version = "93";

if (session_id() == "") {
    session_start();
}

/**
 * An express checkout transaction starts with a token, that
 * identifies to PayPal your transaction
 * In this example, when the script sees a token, the script
 * knows that the buyer has already authorized payment through
 * paypal.  If no token was found, the action is to send the buyer
 * to PayPal to first authorize payment
 */

/**
 * Purpose: 	Prepares the parameters for the SetExpressCheckout API Call.
 * Inputs:
 *		paymentAmount:  	Total value of the shopping cart
 *		currencyCodeType: 	Currency code value the PayPal API
 *		paymentType: 		paymentType has to be one of the following values: Sale or Order or Authorization
 *		returnURL:			the page where buyers return to after they are done with the payment review on PayPal
 *		cancelURL:			the page where buyers return to when they cancel the payment review on PayPal
 */
function CallShortcutExpressCheckout($paymentAmount, $currencyCodeType, $paymentType, $returnURL, $cancelURL, $extra)
{
    // Construct the parameter string that describes the SetExpressCheckout API call in the shortcut implementation
    $nvpstr = "&PAYMENTREQUEST_0_AMT=" . $paymentAmount;
    $nvpstr .= "&PAYMENTREQUEST_0_ITEMAMT=" . $paymentAmount;
    $nvpstr .= "&PAYMENTREQUEST_0_PAYMENTACTION=" . $paymentType;
    $nvpstr .= "&RETURNURL=" . $returnURL;
    $nvpstr .= "&CANCELURL=" . $cancelURL;
    $nvpstr .= "&PAYMENTREQUEST_0_CURRENCYCODE=" . $currencyCodeType;
    $nvpstr .= $extra;

    $_SESSION["currencyCodeType"] = $currencyCodeType;
    $_SESSION["PaymentType"] = $paymentType;

    /**
     * Make the API call to PayPal
     * If the API call succeded, then redirect the buyer to PayPal to begin to authorize payment.
     * If an error occured, show the resulting errors
     */
    $resArray = hash_call("SetExpressCheckout", $nvpstr);
    $ack = strtoupper($resArray["ACK"]);
    if ($ack == "SUCCESS" || $ack == "SUCCESSWITHWARNING") {
        $token = urldecode($resArray["TOKEN"]);
        $_SESSION['TOKEN'] = $token;
    }

    return $resArray;
}

/**
 * Purpose: 	Prepares the parameters for the SetExpressCheckout API Call.
 * Inputs:
 *		paymentAmount:  	Total value of the shopping cart
 *		currencyCodeType: 	Currency code value the PayPal API
 *		paymentType: 		paymentType has to be one of the following values: Sale or Order or Authorization
 *		returnURL:			the page where buyers return to after they are done with the payment review on PayPal
 *		cancelURL:			the page where buyers return to when they cancel the payment review on PayPal
 *		shipToName:		the Ship to name entered on the merchant's site
 *		shipToStreet:		the Ship to Street entered on the merchant's site
 *		shipToCity:			the Ship to City entered on the merchant's site
 *		shipToState:		the Ship to State entered on the merchant's site
 *		shipToCountryCode:	the Code for Ship to Country entered on the merchant's site
 *		shipToZip:			the Ship to ZipCode entered on the merchant's site
 *		shipToStreet2:		the Ship to Street2 entered on the merchant's site
 *		phoneNum:			the phoneNum  entered on the merchant's site
 */
function CallMarkExpressCheckout($paymentAmount, $currencyCodeType, $paymentType, $returnURL,
                                 $cancelURL, $shipToName, $shipToStreet, $shipToCity, $shipToState,
                                 $shipToCountryCode, $shipToZip, $shipToStreet2, $phoneNum
)
{
    // Construct the parameter string that describes the SetExpressCheckout API call in the shortcut implementation
    $nvpstr = "&PAYMENTREQUEST_0_AMT=" . $paymentAmount;
    $nvpstr = $nvpstr . "&PAYMENTREQUEST_0_PAYMENTACTION=" . $paymentType;
    $nvpstr = $nvpstr . "&RETURNURL=" . $returnURL;
    $nvpstr = $nvpstr . "&CANCELURL=" . $cancelURL;
    $nvpstr = $nvpstr . "&PAYMENTREQUEST_0_CURRENCYCODE=" . $currencyCodeType;
    $nvpstr = $nvpstr . "&ADDROVERRIDE=1";
    $nvpstr = $nvpstr . "&PAYMENTREQUEST_0_SHIPTONAME=" . $shipToName;
    $nvpstr = $nvpstr . "&PAYMENTREQUEST_0_SHIPTOSTREET=" . $shipToStreet;
    $nvpstr = $nvpstr . "&PAYMENTREQUEST_0_SHIPTOSTREET2=" . $shipToStreet2;
    $nvpstr = $nvpstr . "&PAYMENTREQUEST_0_SHIPTOCITY=" . $shipToCity;
    $nvpstr = $nvpstr . "&PAYMENTREQUEST_0_SHIPTOSTATE=" . $shipToState;
    $nvpstr = $nvpstr . "&PAYMENTREQUEST_0_SHIPTOCOUNTRYCODE=" . $shipToCountryCode;
    $nvpstr = $nvpstr . "&PAYMENTREQUEST_0_SHIPTOZIP=" . $shipToZip;
    $nvpstr = $nvpstr . "&PAYMENTREQUEST_0_SHIPTOPHONENUM=" . $phoneNum;

    $_SESSION["currencyCodeType"] = $currencyCodeType;
    $_SESSION["PaymentType"] = $paymentType;

    /**
     * Make the API call to PayPal
     * If the API call succeded, then redirect the buyer to PayPal to begin to authorize payment.
     * If an error occured, show the resulting errors
     */
    $resArray = hash_call("SetExpressCheckout", $nvpstr);
    $ack = strtoupper($resArray["ACK"]);
    if ($ack == "SUCCESS" || $ack == "SUCCESSWITHWARNING") {
        $token = urldecode($resArray["TOKEN"]);
        $_SESSION['TOKEN'] = $token;
    }

    return $resArray;
}

/**
 *
 * Purpose: Prepares the parameters for the GetExpressCheckoutDetails API Call.
 *
 * Inputs:
 *		None
 * Returns:
 *		The NVP Collection object of the GetExpressCheckoutDetails Call Response.
 */

function GetShippingDetails($token)
{
    /**
     * At this point, the buyer has completed authorizing the payment
     * at PayPal.  The function will call PayPal to obtain the details
     * of the authorization, including any shipping information of the
     * buyer.  Remember, the authorization is not a completed transaction
     * at this state - the buyer still needs an additional step to finalize
     * the transaction
     *
     * Build a second API request to PayPal, using the token as the
     * ID to get the details on the payment authorization
     */
    $nvpstr = "&TOKEN=" . $token;

    /**
     * Make the API call and store the results in an array.
     * If the call was a success, show the authorization details, and provide
     * an action to complete the payment.
     * If failed, show the error
     */
    $resArray = hash_call("GetExpressCheckoutDetails", $nvpstr);
    $ack = strtoupper($resArray["ACK"]);
    if ($ack == "SUCCESS" || $ack == "SUCCESSWITHWARNING") {
        $_SESSION['payer_id'] = $resArray['PAYERID'];
    }

    return $resArray;
}

/**
 * Purpose: 	Prepares the parameters for the GetExpressCheckoutDetails API Call.
 * Inputs:
 * sBNCode:	The BN code used by PayPal to track the transactions from a given shopping cart.
 * Returns:
 *		The NVP Collection object of the GetExpressCheckoutDetails Call Response.
 */

function ConfirmPayment($FinalPaymentAmt)
{
    /**
     * Gather the information to make the final call to
     * finalize the PayPal payment.  The variable nvpstr
     * holds the name value pairs
     */

    //Format the other parameters that were stored in the session from the previous calls

    $token = urlencode($_SESSION['TOKEN']);
    $paymentType = urlencode($_SESSION['PaymentType']);
    $currencyCodeType = urlencode($_SESSION['currencyCodeType']);
    $payerID = urlencode($_SESSION['payer_id']);
    $serverName = urlencode($_SERVER['SERVER_NAME']);

    $nvpstr = '&TOKEN=' . $token . '&PAYERID=' . $payerID . '&PAYMENTREQUEST_0_PAYMENTACTION=' . $paymentType . '&PAYMENTREQUEST_0_AMT=' . $FinalPaymentAmt;
    $nvpstr .= '&PAYMENTREQUEST_0_CURRENCYCODE=' . $currencyCodeType . '&IPADDRESS=' . $serverName;

    /**
     * Make the call to PayPal to finalize payment
     * If an error occured, show the resulting errors
     */

    $resArray = hash_call("DoExpressCheckoutPayment", $nvpstr);

    /**
     * Display the API response back to the browser.
     * If the response from PayPal was a success, display the response parameters
     * If the response was an error, display the errors received using APIError.php.
     */

    $ack = strtoupper($resArray["ACK"]);
    return $resArray;
}


/**
 * Purpose: 	This function makes a DoDirectPayment API call
 * Inputs:
 *		paymentType:		paymentType has to be one of the following values: Sale or Order or Authorization
 *		paymentAmount:  	total value of the shopping cart
 *		currencyCode:	 	currency code value the PayPal API
 *		firstName:			first name as it appears on credit card
 *		lastName:			last name as it appears on credit card
 *		street:				buyer's street address line as it appears on credit card
 *		city:				buyer's city
 *		state:				buyer's state
 *		countryCode:		buyer's country code
 *		zip:				buyer's zip
 *		creditCardType:		buyer's credit card type (i.e. Visa, MasterCard ... )
 *		creditCardNumber:	buyers credit card number without any spaces, dashes or any other characters
 *		expDate:			credit card expiration date
 *		cvv2:				Card Verification Value
 * Returns:
 *		The NVP Collection object of the DoDirectPayment Call Response.
 */

function DirectPayment($paymentType, $paymentAmount, $creditCardType, $creditCardNumber,
                       $expDate, $cvv2, $firstName, $lastName, $street, $city, $state, $zip,
                       $countryCode, $currencyCode)
{
    //Construct the parameter string that describes DoDirectPayment
    $nvpstr = "&AMT=" . $paymentAmount;
    $nvpstr = $nvpstr . "&CURRENCYCODE=" . $currencyCode;
    $nvpstr = $nvpstr . "&PAYMENTACTION=" . $paymentType;
    $nvpstr = $nvpstr . "&CREDITCARDTYPE=" . $creditCardType;
    $nvpstr = $nvpstr . "&ACCT=" . $creditCardNumber;
    $nvpstr = $nvpstr . "&EXPDATE=" . $expDate;
    $nvpstr = $nvpstr . "&CVV2=" . $cvv2;
    $nvpstr = $nvpstr . "&FIRSTNAME=" . $firstName;
    $nvpstr = $nvpstr . "&LASTNAME=" . $lastName;
    $nvpstr = $nvpstr . "&STREET=" . $street;
    $nvpstr = $nvpstr . "&CITY=" . $city;
    $nvpstr = $nvpstr . "&STATE=" . $state;
    $nvpstr = $nvpstr . "&COUNTRYCODE=" . $countryCode;
    $nvpstr = $nvpstr . "&IPADDRESS=" . $_SERVER['REMOTE_ADDR'];

    $resArray = hash_call("DoDirectPayment", $nvpstr);

    return $resArray;

}

/**
 *
 * hash_call: Function to perform the API call to PayPal using API signature
 * @methodName is name of API  method.
 * @nvpStr is nvp string.
 * returns an associtive array containing the response from the server.
 *
 */
function hash_call($methodName, $nvpStr)
{
    //declaring of global variables
    global $API_Endpoint, $version, $API_UserName, $API_Password, $API_Signature;
    global $USE_PROXY, $PROXY_HOST, $PROXY_PORT;
    global $sBNCode;

    //setting the curl parameters.
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $API_Endpoint);
    curl_setopt($ch, CURLOPT_VERBOSE, 1);
    //turning off the server and peer verification(TrustManager Concept).
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_POST, 1);

    //if USE_PROXY constant set to TRUE in Constants.php, then only proxy will be enabled.
    //Set proxy name to PROXY_HOST and port number to PROXY_PORT in constants.php
    if ($USE_PROXY) {
        curl_setopt($ch, CURLOPT_PROXY, $PROXY_HOST . ":" . $PROXY_PORT);
    }

    //NVPRequest for submitting to server
    $nvpreq = "METHOD=" . urlencode($methodName) . "&VERSION=" . urlencode($version) .
        "&PWD=" . urlencode($API_Password) . "&USER=" . urlencode($API_UserName) .
        "&SIGNATURE=" . urlencode($API_Signature) . $nvpStr . "&BUTTONSOURCE=" . urlencode($sBNCode);

    //setting the nvpreq as POST FIELD to curl
    curl_setopt($ch, CURLOPT_POSTFIELDS, $nvpreq);
    //getting response from server
    $response = curl_exec($ch);
    //converting NVPResponse to an Associative Array
    $nvpResArray = deformatNVP($response);
    $nvpReqArray = deformatNVP($nvpreq);

    $_SESSION['nvpReqArray'] = $nvpReqArray;

    if (curl_errno($ch)) {
        // moving to display page to display curl errors
        $_SESSION['curl_error_no'] = curl_errno($ch);
        $_SESSION['curl_error_msg'] = curl_error($ch);
        //Execute the Error handling module to display errors.
    } else {
        //closing the curl
        curl_close($ch);
    }

    return $nvpResArray;
}

/**
 * Purpose: Redirects to PayPal.com site.
 * Inputs:  NVP string.
 */

function RedirectToPayPal($token)
{
    global $PAYPAL_URL;
    // Redirect to paypal.com here
    $payPalURL = $PAYPAL_URL . $token;
    header("Location: " . $payPalURL);
    exit;
}

/**
 * This function will take NVPString and convert it to an Associative Array and it will decode the response.
 * It is usefull to search for a particular key and displaying arrays.
 * @nvpstr is NVPString.
 * @nvpArray is Associative Array.
 */

function deformatNVP($nvpstr)
{
    $intial = 0;
    $nvpArray = array();

    while (strlen($nvpstr)) {
        //postion of Key
        $keypos = strpos($nvpstr, '=');
        //position of value
        $valuepos = strpos($nvpstr, '&') ? strpos($nvpstr, '&') : strlen($nvpstr);
        /*getting the Key and Value values and storing in a Associative Array*/
        $keyval = substr($nvpstr, $intial, $keypos);
        $valval = substr($nvpstr, $keypos + 1, $valuepos - $keypos - 1);
        //decoding the respose
        $nvpArray[urldecode($keyval)] = urldecode($valval);
        $nvpstr = substr($nvpstr, $valuepos + 1, strlen($nvpstr));
    }

    return $nvpArray;
}