using PayPal.Api;
using System;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace PayPalCS
{
    public partial class PayPalCallback : System.Web.UI.Page
    {
protected void Page_Load(object sender, EventArgs e)
{
// From https://msdn.microsoft.com/en-us/library/system.web.httprequest.params(v=vs.110).aspx
// Create a string to contain the paramaters'
// information.
string paramInfo = "";
// Obtain a reference to the Request.Params
// collection.
NameValueCollection pColl = Request.Params;

string paymentId="";
string token = "";
string PayerID = "";
// Iterate through the collection and add
// each key to the string variable.
for (int i = 0; i <= pColl.Count - 1; i++)
{
    paramInfo += "Key: " + pColl.GetKey(i) + "<br />";

    // Create a string array that contains
    // the values associated with each key.
    string[] pValues = pColl.GetValues(i);

    // Iterate through the array and add
    // each value to the string variable.
    for (int j = 0; j <= pValues.Length - 1; j++)
    {
        paramInfo += "Value:" + pValues[j] + "<br /><br />";

    }

    if( pColl.GetKey(i) == "paymentId")
        paymentId = pColl.GetValues(i)[0];
    if (pColl.GetKey(i) == "token")
        token = pColl.GetValues(i)[0];
    if (pColl.GetKey(i) == "PayerID")
        PayerID = pColl.GetValues(i)[0];
}
paramInfo = "paymentId:" + paymentId + "<br/>" + paramInfo;
paramInfo = "token:" + token + "<br/>" + paramInfo;
paramInfo = "PayerID:" + PayerID + "<br/>" + paramInfo;
// Set a Label's Text property to the values
// contained in the string variable.

// This is from https://devtools-paypal.com/guide/pay_paypal
APIContext apiContext = new APIContext( Global.accessString );

Dictionary<string, string> sdkConfig = new Dictionary<string, string>();
sdkConfig.Add("mode", "sandbox");
apiContext.Config = sdkConfig;


Payment payment = new Payment();
payment.id = paymentId;
PaymentExecution paymentExecute = new PaymentExecution();
paymentExecute.payer_id = PayerID;
Payment p = payment.Execute(apiContext, paymentExecute);
paramInfo = "<h1>DONE!</h1>" + paramInfo;
paramInfo = "state: " + p.state + "<br/>" + paramInfo;

lblParams.Text = paramInfo;
}
    }
}