启用自动退货，捐赠已过帐，但用户必须单击黄色“返回协调员”按钮才能返回。如果你看到这个片段有什么问题，请告诉我..
P.S。我不想使用自定义按钮。
<form action="https://www.sandbox.paypal.com/cgi-bin/webscr" method="post">
<!-- Identify your business so that you can collect the payments. -->
<input type="hidden" name="business" value="email@gmail.com">
<!-- Specify a Donate button. -->
<input type="hidden" name="cmd" value="_donations">
<!-- Specify details about the contribution -->
<input type="hidden" name="item_name" value="@Resources.Donations.Strings.ThankYou">
<input type="hidden" name="return" value="http://www.return.com/thankyou"/>
<input type="hidden" name="cancel_return" value="http://www.return.com/cancel"/>
<input type="hidden" name="rm" value="2"/>
<input type="hidden" name="item_number" value="5.00">
<select name="amount" onchange="$('input[name=item_number]').val($(this).val())">
<option value="1.00">$1.00</option>
<option value="5.00" selected>$5.00</option>
<option value="10.00">$10.00</option>
<option value="15.00">$15.00</option>
<option value="25.00">$25.00</option>
<option value="50.00">$50.00</option>
<option value="">@Resources.Donations.Labels.Other</option>
</select>
<input type="hidden" name="currency_code" value="USD">
<!-- Display the payment button. -->
<button type="submit" name="submit" class="btn btn-large btn-paypal"></button>
</form>
答案 0 :(得分：0)
正如安德鲁建议的那样，我重构了我的代码以使用IPN。这是我开始使用的一些代码..这是一些带有日志记录的代码，可以帮助您入门..
HTML表单：
<form action="https://www.paypal.com/cgi-bin/webscr" method="post">
<!-- Identify your business so that you can collect the payments. -->
<input type="hidden" name="business" value="donations@myemail.org">
<!-- Specify a Donate button. -->
<input type="hidden" name="cmd" value="_donations">
<!-- Specify details about the contribution -->
<input type="hidden" name="item_name" value="@Resources.Donations.Strings.ThankYou">
<input type="hidden" name="return" value="auto_return_url_here"/>
<input type="hidden" name="notify_url" value="IPN_notify_url_here"/>
<input type="hidden" name="cancel_return" value="user_clicked_cancel_url_here"/>
<input type="hidden" name="rm" value="2" />
<input type="hidden" name="item_number" value="5.00">
<select name="amount" onchange="$('input[name=item_number]').val($(this).val())">
<option value="1.00">$1.00</option>
<option value="5.00" selected>$5.00</option>
<option value="10.00">$10.00</option>
<option value="15.00">$15.00</option>
<option value="25.00">$25.00</option>
<option value="50.00">$50.00</option>
<option value="">Other</option>
</select>
<input type="hidden" name="currency_code" value="USD">
<!-- Display the payment button. -->
<button type="submit" name="submit" class="btn btn-large btn-paypal"></button>
</form>
IPN处理程序示例：
[HttpPost]
[AllowAnonymous]
public ActionResult PayPalDonationIpn(PayPalModel model)
{
Logger.InfoFormat("{0} - {1}",
model.txn_id, model.payment_status);
Logger.Info(model.ToXml());
if (!model.receiver_email.Equals(PayPalEmail, StringComparison.OrdinalIgnoreCase))
{
Logger.WarnFormat("Email 'receiver_email' value '{0}' does not match our email '{1}'.", model.receiver_email, base.PayPalEmail);
}
if (model.txn_id == null)
{
Logger.Warn("Parameter 'txn_id' is empty.");
}
var request = (HttpWebRequest)WebRequest.Create(PayPalPostUri);
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";
var param = Request.BinaryRead(Request.ContentLength);
var message = Encoding.ASCII.GetString(param);
message += "&cmd=_notify-validate";
request.ContentLength = message.Length;
//send the request to PayPal and get the response
using (var streamOut = new StreamWriter(request.GetRequestStream(), Encoding.ASCII))
{
streamOut.Write(message);
streamOut.Close();
using (var streamIn = new StreamReader(request.GetResponse().GetResponseStream()))
{
var response = streamIn.ReadToEnd();
streamIn.Close();
Logger.Info(response);
if (response.Equals("VERIFIED", StringComparison.OrdinalIgnoreCase))
{
Logger.InfoFormat("{0} - {1}, {2}", model.txn_id, model.mc_gross, model.mc_currency);
//check the payment_status is Completed
//check that txn_id has not been previously processed
//check that payment_amount/payment_currency are correct
//process payment
}
else if (response.Equals("INVALID", StringComparison.OrdinalIgnoreCase))
{
Logger.WarnFormat("INVALID response: {0}.", message);
}
else
{
Logger.WarnFormat("No status. Manual investinagation needed for {0}.", message);
}
}
}
return new EmptyResult();
}
这是带有变量名称的PayPalModel：
public class PayPalModel
{
public string mc_gross { get; set; }
public string protection_eligibility { get; set; }
public string address_status { get; set; }
public string payer_id { get; set; }
public string tax { get; set; }
public string address_street { get; set; }
public string payment_date { get; set; }
public string payment_status { get; set; }
public string charset { get; set; }
public string address_zip { get; set; }
public string first_name { get; set; }
public string address_country_code { get; set; }
public string address_name { get; set; }
public string notify_version { get; set; }
public string custom { get; set; }
public string payer_status { get; set; }
public string address_country { get; set; }
public string address_city { get; set; }
public string quantity { get; set; }
public string payer_email { get; set; }
public string verify_sign { get; set; }
public string txn_id { get; set; }
public string payment_type { get; set; }
public string payer_business_name { get; set; }
public string last_name { get; set; }
public string address_state { get; set; }
public string receiver_email { get; set; }
public string pending_reason { get; set; }
public string txn_type { get; set; }
public string item_name { get; set; }
public string mc_currency { get; set; }
public string item_number { get; set; }
public string residence_country { get; set; }
public string test_ipn { get; set; }
public string transaction_subject { get; set; }
public string payment_gross { get; set; }
public string merchant_return_link { get; set; }
public string auth { get; set; }
public string ipn_track_id { get; set; }
}