Online Payments Using PayPal- Integration with ASP.NET

 Steps to integrate Paypal API to ASP.NET:

Step-1) Create Paypal Merchant Account @ www.paypal.com using valid Mail Account

Step-2) Provide Debit or Credit Card No and Its Type.

Step-3) Develop ASP.NET Page According To Your Requirement

Step-4) Integrate API by Passing Website Variables as a Input to PayPal Account Using our Mail Account writing customized Business logic

Step-1) Create Paypal Merchant Account @ www.paypal.com using valid Mail Account :

Open www.payapal.com and register with valid Credentials as depicted below, here I used my mail account for receiving amounts, keep remember that this id will use full @ the time of integrating api with Business logic and registered with Business name. When the time I redirected from ASP.NET Page to PayPal Account Business Name will be displayed @ the top of the Paypal web page by using Mail Account I created.

After creating Account, the account internals will be created to Individual

In The above screen @ right hand side in Notifications option, I marked as red circle, in that link provide bank credit and debit card numbers. Left hand side Green Circle indicates money payments and Receivables information was provided. Black Color circle link indicates account status Verification option.

 Step-2) Provide Debit or Credit Card No and Its Type

Step-3) Develop ASP.NET Page According To Requirement

I considered online shopping Scenario by displaying electronic Gadgets on Asp.Net Web Page. In this Step I designed a Page by Using Three Images (Xbox, Bluetooth Headset,) three Labels to display the Currency on Web Page to the respective Electronic Gadgets and three Image Buttons.

Step-4) Integrate API by Passing Website Variables as an Input to PayPal Account using our Mail Account writing customized Business logic.

Before going to write Business logic we just discuss Paypal API Link and its Parameters

Paypal API

https://www.paypal.com/cgi-bin/webscr?cmd=_cart&business=mailid@server.com&businessname &item_name=Welcome Back&amount=10&currency=USD&add=5

The above mentioned URL is a Constructive link to get the values from the website to Paypal Gateway. In the URL bold Letters indicates predefined parameters .Following are the some of the Parameter values and their descriptions

Now add Class [RedirectToPaypal.cs] File in App_Code Folder. Write One Static Method by taking only two [as per as your requirement you can take n-no of parameters to the function with predefined variable names mentioned in the above table] dynamic parameters. Here I am using single item Transaction for Shopping Scenario. Write Method as Follows in C# Language to construct a link.

public static string  getItemNameAndCost(string itemName, string itemCost)


    {

        //Converting String Money Value Into Decimal



       decimal price = Convert.ToDecimal(itemCost);



        //declaring empty String



       string returnURL = "";



       returnURL +="https://www.paypal.com/xclick/business=bangarubabu.p@gmail.com";



        //PassingItem Name as dynamic



       returnURL +="&item_name="+itemName;



        //AssigningName as Statically to Parameter



       returnURL += "&first_name"+ "Raghunadh Babu";



       //AssigningCity as Statically to Parameter



       returnURL += "&city"+ "Hyderabad";



       //Assigning State as Statically to Parameter



       returnURL += "&state"+ "Andhra Pradesh";



       //Assigning Country as Statically to Parameter



       returnURL += "&country" + "India";



        //Passing Amount as Dynamic



       returnURL += "&amount=" + price;



       //Passing Currency as your 



       returnURL += "&currency=USD";



       //retturn Url if Customer wants To return to Previous Page



       returnURL += "&return=http://bangarubabupureti.spaces.live.com";



       //retturn Url if Customer Wants To Cancel the Transaction



       returnURL += "&cancel_return=http://bangarubabupureti.spaces.live.com";



       return returnURL;




    }




Write Code Under Image Butons 
protected void ImageButton1_Click(object sender, ImageClickEventArgs e)



    {



        string iName="XBox";



        string responseURL = RedirectToPaypal.getItemNameAndCost(iName,
lblxbox.Text);





        Response.Redirect(responseURL);       



    }



    protected void ImageButton4_Click(object sender, ImageClickEventArgs e)

  {



        string iName = "Philips Mobile";



        string responseURL = RedirectToPaypal.getItemNameAndCost(iName,
lblphone.Text);



        Response.Redirect(responseURL); 


     }



    protected void ImageButton5_Click(object sender, ImageClickEventArgs e)


    {

        string iName = "BlueTooth HeadSet";


        string responseURL = RedirectToPaypal.getItemNameAndCost(iName,
lblbluetooth.Text);





        Response.Redirect(responseURL);      




    }

Now run and Click On shop Now Paypal Button under Xbox, it will automatically Redirects to Paypal Web Site with your given input, the customer will pay according to your Specifications in the Website

Here I used only _xclick command, if you want to add shopping cart or donations or subscriptions, you can customize application according to your requirement.

My Reference:

http://www.payapal.com