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application at the end of this tutorial. 
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7.
Create the buyer test account by clicking the Create Account button. 
The Sandbox Test accounts page is displayed. 
8.
On the Sandbox test accounts page, click the facilitator email account. 
Profile and Notification options appear. 
9.
Select the Profile option, then click API credentials to view your API credentials for the 
merchant test account. 
10.
Copy the TEST API credentials to notepad. 
You will need your displayed Classic TEST API credentials (Username, Password, and Signature) 
to make API calls from the Wingtip Toys sample application to the PayPal testing environment. 
You will add the credentials in the next step.  
Add PayPal Class and API Credentials 
You will place the majority of the PayPal code into a single class. This class contains the methods 
used to communicate with PayPal. Also, you will add your PayPal credentials to this class. 
1.
In the Wingtip Toys sample application within Visual Studio, right-click the Logic folder 
and then select Add -> New Item.  
The Add New Item dialog box is displayed. 
2.
Under Visual C# from the Installed pane on the left, select Code. 
3.
From the middle pane, select Class. Name this new class PayPalFunctions.cs. 
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4.
Click Add. 
The new class file is displayed in the editor.  
5.
Replace the default code with the following code: 
System; 
using
System.Collections; 
using
System.Collections.Specialized; 
using
System.IO; 
using
System.Net; 
using
System.Text; 
using
System.Data; 
using
System.Configuration; 
using
System.Web; 
using
WingtipToys; 
using
WingtipToys.Models; 
using
System.Collections.Generic; 
using
System.Linq; 
using
public class
NVPAPICaller
//Flag that determines the PayPal environment (live or sandbox)
bSandbox = 
private const bool
true
CVV2 = 
private const string
"CVV2"
// Live strings.
pEndPointURL = 
private string
"https://api-3t.paypal.com/nvp"
host = 
private string
"www.paypal.com"
// Sandbox strings.
pEndPointURL_SB = 
private string
"https://api-3t.sandbox.paypal.com/nvp"
host_SB = 
private string
"www.sandbox.paypal.com"
SIGNATURE = 
private const string
"SIGNATURE"
PWD = 
private const string
"PWD"
ACCT = 
private const string
"ACCT"
//Replace <Your API Username> with your API Username
//Replace <Your API Password> with your API Password
//Replace <Your Signature> with your Signature
APIUsername = 
public string
"<Your API Username>"
APIPassword = 
private string
"<Your API Password>"
APISignature = 
private string
"<Your Signature>"
Subject = 
private string
""
BNCode = 
private string
"PP-ECWizard"
//HttpWebRequest Timeout specified in milliseconds 
Timeout = 15000; 
private const int
[] SECURED_NVPS = 
[] { ACCT, CVV2, 
private static readonly string
new string
SIGNATURE, PWD }; 
SetCredentials(
Userid, 
Pwd, 
Signature) 
public void
string
string
string
APIUsername = Userid; 
APIPassword = Pwd; 
APISignature = Signature; 
ShortcutExpressCheckout(
amt, 
token, 
public bool
string
ref string
ref string
retMsg) 
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(bSandbox) 
if
pEndPointURL = pEndPointURL_SB; 
host = host_SB; 
returnURL = 
string
"http://localhost:1234/Checkout/CheckoutReview.aspx"
cancelURL = 
string
"http://localhost:1234/Checkout/CheckoutCancel.aspx"
encoder = 
NVPCodec
new
(); 
NVPCodec
encoder[
] = 
"METHOD"
"SetExpressCheckout"
encoder[
] = returnURL; 
"RETURNURL"
encoder[
] = cancelURL; 
"CANCELURL"
encoder[
] = 
"BRANDNAME"
"Wingtip Toys Sample Application"
encoder[
] = amt; 
"PAYMENTREQUEST_0_AMT"
encoder[
] = amt; 
"PAYMENTREQUEST_0_ITEMAMT"
encoder[
] = 
"PAYMENTREQUEST_0_PAYMENTACTION"
"Sale"
encoder[
] = 
"PAYMENTREQUEST_0_CURRENCYCODE"
"USD"
// Get the Shopping Cart Products
(WingtipToys.Logic.
using
myCartOrders = 
ShoppingCartActions
new
WingtipToys.Logic.
()) 
ShoppingCartActions
<
> myOrderList = myCartOrders.GetCartItems(); 
List CartItem
(
i = 0; i < myOrderList.Count; i++) 
for int
encoder[
+ i] = 
"L_PAYMENTREQUEST_0_NAME"
myOrderList[i].Product.ProductName.ToString(); 
encoder[
+ i] = 
"L_PAYMENTREQUEST_0_AMT"
myOrderList[i].Product.UnitPrice.ToString(); 
encoder[
+ i] = 
"L_PAYMENTREQUEST_0_QTY"
myOrderList[i].Quantity.ToString(); 
pStrrequestforNvp = encoder.Encode(); 
string
pStresponsenvp = HttpCall(pStrrequestforNvp); 
string
decoder = 
NVPCodec
new
(); 
NVPCodec
decoder.Decode(pStresponsenvp); 
strAck = decoder[
string
].ToLower(); 
"ACK"
(strAck != 
&& (strAck == 
if
null
|| strAck == 
"success"
)) 
"successwithwarning"
token = decoder[
]; 
"TOKEN"
ECURL = 
string
+ host + 
"https://"
"/cgi-bin/webscr?cmd=_express-
+ token; 
checkout"
"&token="
retMsg = ECURL; 
return true
else
retMsg = 
+ decoder[
] + 
"ErrorCode="
"L_ERRORCODE0"
"&"
+ decoder[
] + 
"Desc="
"L_SHORTMESSAGE0"
"&"
+ decoder[
]; 
"Desc2="
"L_LONGMESSAGE0"
return false
GetCheckoutDetails(
token, 
PayerID, 
public bool
string
ref string
ref
NVPCodec
decoder, 
retMsg) 
ref string
(bSandbox) 
if
pEndPointURL = pEndPointURL_SB; 
encoder = 
NVPCodec
new
(); 
NVPCodec
encoder[
] = 
"METHOD"
"GetExpressCheckoutDetails"
encoder[
] = token; 
"TOKEN"
pStrrequestforNvp = encoder.Encode(); 
string
pStresponsenvp = HttpCall(pStrrequestforNvp); 
string
decoder = 
new
(); 
NVPCodec
decoder.Decode(pStresponsenvp); 
strAck = decoder[
string
].ToLower(); 
"ACK"
(strAck != 
&& (strAck == 
if
null
|| strAck == 
"success"
)) 
"successwithwarning"
PayerID = decoder[
]; 
"PAYERID"
return true
else
retMsg = 
+ decoder[
] + 
"ErrorCode="
"L_ERRORCODE0"
"&"
+ decoder[
] + 
"Desc="
"L_SHORTMESSAGE0"
"&"
+ decoder[
]; 
"Desc2="
"L_LONGMESSAGE0"
return false
DoCheckoutPayment(
finalPaymentAmount, 
token, 
public bool
string
string
string
PayerID, 
ref
decoder, 
NVPCodec
retMsg) 
ref string
(bSandbox) 
if
pEndPointURL = pEndPointURL_SB; 
encoder = 
NVPCodec
new
(); 
NVPCodec
encoder[
] = 
"METHOD"
"DoExpressCheckoutPayment"
encoder[
] = token; 
"TOKEN"
encoder[
] = PayerID; 
"PAYERID"
encoder[
] = finalPaymentAmount; 
"PAYMENTREQUEST_0_AMT"
encoder[
] = 
"PAYMENTREQUEST_0_CURRENCYCODE"
"USD"
encoder[
] = 
"PAYMENTREQUEST_0_PAYMENTACTION"
"Sale"
pStrrequestforNvp = encoder.Encode(); 
string
pStresponsenvp = HttpCall(pStrrequestforNvp); 
string
decoder = 
new
(); 
NVPCodec
decoder.Decode(pStresponsenvp); 
strAck = decoder[
string
].ToLower(); 
"ACK"
(strAck != 
&& (strAck == 
if
null
|| strAck == 
"success"
)) 
"successwithwarning"
return true
else
retMsg = 
+ decoder[
] + 
"ErrorCode="
"L_ERRORCODE0"
"&"
+ decoder[
] + 
"Desc="
"L_SHORTMESSAGE0"
"&"
+ decoder[
]; 
"Desc2="
"L_LONGMESSAGE0"
return false
HttpCall(
NvpRequest) 
public string
string
url = pEndPointURL; 
string
strPost = NvpRequest + 
string
+ buildCredentialsNVPString(); 
"&"
strPost = strPost + 
"&BUTTONSOURCE="
.UrlEncode(BNCode); 
HttpUtility
objRequest = (
)
.Create(url); 
HttpWebRequest
HttpWebRequest WebRequest
objRequest.Timeout = Timeout; 
objRequest.Method = 
"POST"
objRequest.ContentLength = strPost.Length; 
try
(
using
myWriter = 
StreamWriter
new
(objRequest.GetRequestStream())) 
StreamWriter
myWriter.Write(strPost); 
(
catch
Exception
// No logging for this tutorial.
//Retrieve the Response returned from the NVP API call to PayPal.
objResponse = (
)objRequest.GetResponse(); 
HttpWebResponse
HttpWebResponse
result; 
string
(
using
sr = 
StreamReader
new
(objResponse.GetResponseStream())) 
StreamReader
result = sr.ReadToEnd(); 
result; 
return
buildCredentialsNVPString() 
private string
codec = 
NVPCodec
new
(); 
NVPCodec
(!IsEmpty(APIUsername)) 
if
codec[
] = APIUsername; 
"USER"
(!IsEmpty(APIPassword)) 
if
codec[PWD] = APIPassword; 
(!IsEmpty(APISignature)) 
if
codec[SIGNATURE] = APISignature; 
(!IsEmpty(Subject)) 
if
codec[
] = Subject; 
"SUBJECT"
codec[
] = 
"VERSION"
"88.0"
codec.Encode(); 
return
IsEmpty(
s) 
public static bool
string
s == 
|| s.Trim() == 
.Empty; 
return
null
string
public sealed class
NVPCodec
NameValueCollection
AMPERSAND = 
private const string
"&"
EQUALS = 
private const string
"="
[] AMPERSAND_CHAR_ARRAY = 
private static readonly char
AMPERSAND.ToCharArray(); 
[] EQUALS_CHAR_ARRAY = EQUALS.ToCharArray(); 
private static readonly char
Encode() 
public string
sb = 
StringBuilder
new
(); 
StringBuilder
firstPair = 
bool
true
(
kv 
AllKeys) 
foreach
string
in
name = 
string
.UrlEncode(kv); 
HttpUtility
value = 
string
.UrlEncode(
HttpUtility
[kv]); 
this
(!firstPair) 
if
sb.Append(AMPERSAND); 
sb.Append(name).Append(EQUALS).Append(value); 
firstPair = 
false
sb.ToString(); 
return
Decode(
nvpstring) 
public void
string
Clear(); 
(
nvp   nvpstring.Split(AMPERSAND_CHAR_ARRAY)) 
foreach
string
in
[] tokens = nvp.Split(EQUALS_CHAR_ARRAY); 
string
(tokens.Length >= 2) 
if
name = 
string
.UrlDecode(tokens[0]); 
HttpUtility
value = 
string
.UrlDecode(tokens[1]); 
HttpUtility
Add(name, value); 
Add(
name, 
value, 
index) 
public void
string
string
int
.Add(GetArrayName(index, name), value); 
this
Remove(
arrayName, 
index) 
public void
string
int
.Remove(GetArrayName(index, arrayName)); 
this
[
name, 
index] 
public string this string
int
get
[GetArrayName(index, name)]; 
return this
set
[GetArrayName(index, name)] = 
this
value
GetArrayName(
index, 
name) 
private static string
int
string
(index < 0) 
if
throw new
(
ArgumentOutOfRangeException
"index"
"index cannot be negative 
+ index); 
: "
name + index; 
return
6.
Add the Merchant API credentials (Username, Password, and Signature) that you 
displayed earlier in this tutorial so that you can make function calls to the PayPal testing 
environment. 
public string APIUsername = "<Your API Username>"; 
private string APIPassword = "<Your API Password>"; 
private string APISignature = "<Your Signature>"; 
Note 
In this sample application you are simply adding credentials to a C# file (.cs). However, in a 
implemented solution, you should consider encrypting your credentials in a configuration file.  
The NVPAPICaller class contains the majority of the PayPal functionality. The code in the class 
provides the methods needed to make a test purchase from the PayPal testing environment. The 
following three PayPal functions are used to make purchases: 
1.
SetExpressCheckout function 
2.
GetExpressCheckoutDetails function 
3.
DoExpressCheckoutPayment function 
The ShortcutExpressCheckout method collects the test purchase information and product 
details from the shopping cart and calls the SetExpressCheckout PayPal function. The 
GetCheckoutDetails method confirms purchase details and calls the 
GetExpressCheckoutDetails PayPal function before making the test purchase. The 
DoCheckoutPayment method completes the test purchase from the testing environment by 
calling the DoExpressCheckoutPayment PayPal function. The remaining code supports the 
PayPal methods and process, such as encoding strings, decoding strings, processing arrays, and 
determining credentials. 
Note 
PayPal allows you to include optional purchase details based on PayPal’s API specification. By 
extending the code in the Wingtip Toys sample application, you can include localization details, 
product descriptions, tax, a customer service number, as well as many other optional fields.  
Notice that the return and cancel URLs that are specified in the ShortcutExpressCheckout 
method use a port number.  
string returnURL = 
"http://localhost:1234/Checkout/CheckoutReview.aspx"; 
string cancelURL = 
"http://localhost:1234/Checkout/CheckoutCancel.aspx"; 
When Visual Web Developer runs a web project, a random port is used for the web server. As 
shown above, the port number is 1234. When you run the application, you'll probably see a 
different port number. Your port number needs to be set in the above code so that you can 
successful run the Wingtip Toys sample application at the end of this tutorial. The next section 
of this tutorial explains how to retrieve the local host port number and update the PayPal class. 
Update the LocalHost Port Number in the PayPal Class 
The Wingtip Toys sample application purchases products by navigating to the PayPal testing site 
and returning to your local instance of the Wingtip Toys sample application. In order to have 
PayPal return to the correct URL, you need to specify the port number of the locally running 
sample application in the PayPal code mentioned above. 
1.
Right-click the project name (WingtipToys) in Solution Explorer and select Properties. 
2.
In the left column, select the Web tab. 
3.
Retrieve the port number from the Project Url box. 
4.
Update the returnURL and cancelURL in the PayPal class (NVPAPICaller) in the 
PayPalFunctions.cs file to use the port number of your web application:  
string returnURL = "http://localhost:<Your Port 
Number>/Checkout/CheckoutReview.aspx"; 
string cancelURL = "http://localhost:<Your Port 
Number>/Checkout/CheckoutCancel.aspx"; 
Now the code that you added will match the expected port for your local Web application. 
PayPal will be able to return to the correct URL on your local machine. 
Add the PayPal Checkout Button 
Now that the primary PayPal functions have been added to the sample application, you can 
begin adding the markup and code needed to call these functions. First, you must add the 
checkout button that the user will see on the shopping cart page. 
1.
Open the ShoppingCart.aspx file. 
2.
Scroll to the bottom of the file and find the <!--Checkout Placeholder --> 
comment. 
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