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Thanks a lot,
Rolando.-
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ECF Version: 4.1.2
Full Source Code License
Windows 2003 Server
SQL Server 2005 Standard
Visual Studio 2005 SP1
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Answer provided in email correspondance:

PayPal works the following way:
    During the checkout process, the customer is redirected to PayPal site. While redirecting to PayPal site, ReturnURL is passed to the gateway in query string (PayPal) or as a function parameter - we use PayPal API here (PayPalExpress). CancelURL is passed the same way. This can be seen, for example, in WebUtility\Plugins\PaymentGateways\PayPalExpress\PayPalExpressGateway.cs file.
On the site the customer enters payment info (does not actually pay, only establishes something like "session" with paypal). After clicking on "continue" button on that site he goes back to the store. Here paypal returns special token that will be used later to perform transaction. When customer clicks "Place order", CreateOrder method in WebServices is called and that's where Charge method for the payment gateway is executed and payment transaction is processed (Token returned by the paypal is used here).

    For PayPal Express we use special checkout controls, including CheckoutWizardModule (see folder  PublicStore\MasterTemplates\Default\Modules\Checkout\PayPalExpress\).
    How to get redirected to exact wizard step after entering payment info, you can see InitializeData() method in PublicStore\MasterTemplates\Default\Modules\Checkout\PayPalExpress\CheckoutPayPalExpressWizardModule.ascx file.
    The idea is very simple: during wizard initialization, data returned from paypal get checked and depending on what is returned (whether customer cancelled or confirmed payment) the corresponding step is loaded. That's why CancelURL and ReturnURL are the same and point to CheckoutWizard.

PayPal site contains document describing the whole checkout process. Here's the link: https://www.paypal.com/en_US/pdf/PayflowPro_Guide.pdf
Diagram showing checkout process is on page 70.

Could you please be more detail?
I have the same problem in ECF G5, I can't return to the correct step. how can I do that?
Another question, where should I bring the customer to PayPal web site? (call SetExpressCheckout method) in which method/event?

Thanks in advance.

Allan

Hi Alan,

This forum is for ECF 4.x.  For ECF G5 questions, please email ecf50@mediachase.com.

Mediachase Software

My paypal express checkout works until I click [Process Payment]

I get the error
Failed to process payment for payment option "PayPal Express"

The error is occuring somewhere in ClientCart.PlaceOrder but I am unable to debug it due to not having the backend code and PayPalExpress not working at all when I try to run it locally.

Any idea what is going on?

In Mediachase.eCF.Web.Plugins.PaymentGateways.PayPalExpress the comment mentions "ECF Web Service will be the one that actually initiates the final order submission to the PayPal service." What webservice is that exactly. Also is there any way to get a more detailed error then mentioned above.

Please help, this is doing my head in.

Cheers
Tim

Hi Tim,

It is difficult for us to help troubleshoot payment gateway issues if you do not have the full source code.

Here is some documentation in case you haven't seen them already --

http://docs.mediachase.com/doku.php?id=ecf:41:tutorials:paypal
http://docs.mediachase.com/doku.php?id=ecf:41:tutorials:payment

Hope this helps.

Mediachase Software

Thanks TB...

I have read both of those articles and they didn't really help much unfortunately..

Here is an extact of my log file. See if you can work out what is going on. Usually I dont even get the Paypal: Transaction failed message. I never see the DoExpressCheckoutPayment in the log call so I assume the error is before it is sent?!?
2010-02-10 11:48:58,810 [2920] INFO  com.paypal.sdk.core.APICaller [(null)] - SetExpressCheckout sent
2010-02-10 11:49:00,310 [2920] INFO  com.paypal.sdk.core.APICaller [(null)] - SetExpressCheckout Ack : Success Elapsed Time : 500 ms
2010-02-10 11:50:10,735 [2920] INFO  com.paypal.sdk.core.APICaller [(null)] - GetExpressCheckoutDetails sent
2010-02-10 11:50:12,251 [2920] INFO  com.paypal.sdk.core.APICaller [(null)] - GetExpressCheckoutDetails Ack : Success Elapsed Time : 515 ms
2010-02-10 11:50:12,251 [2920] INFO  com.paypal.sdk.core.APICaller [(null)] - GetExpressCheckoutDetails sent
2010-02-10 11:50:13,891 [2920] INFO  com.paypal.sdk.core.APICaller [(null)] - GetExpressCheckoutDetails Ack : Success Elapsed Time : 640 ms
2010-02-10 11:50:21,735 [5044] INFO  com.paypal.sdk.core.APICaller [(null)] - GetExpressCheckoutDetails sent
2010-02-10 11:50:23,314 [5044] INFO  com.paypal.sdk.core.APICaller [(null)] - GetExpressCheckoutDetails Ack : Success Elapsed Time : 578 ms
2010-02-10 12:04:39,409 [180] ERROR Mediachase.eCF.BusLayer.Audit.Log [(null)] - PayPal: Transaction Failed
System.Net.WebException: The request was aborted: The request was canceled. ---> System.IO.IOException: Cannot close stream until all bytes are written.
   at System.Net.ConnectStream.CloseInternal(Boolean internalCall, Boolean aborting)
   --- End of inner exception stack trace ---
   at System.Net.ConnectStream.CloseInternal(Boolean internalCall, Boolean aborting)
   at System.Net.ConnectStream.System.Net.ICloseEx.CloseEx(CloseExState closeState)
   at System.Net.ConnectStream.Dispose(Boolean disposing)
   at System.IO.Stream.Close()
   at System.IO.StreamWriter.Dispose(Boolean disposing)
   at System.IO.StreamWriter.Close()
   at Mediachase.eCF.PaymentGateways.Paypal.PayPalResponsePage.Page_Load(Object sender, EventArgs e)
2010-02-10 12:05:28,130 [5648] ERROR Mediachase.eCF.BusLayer.Audit.Log [(null)] - Paypal: Transaction failed, response INVALID

Cheers
Tim

Hi Tim,

Unfortunately, this log does not provide enough details. 

What version of the ECF are you running? 

Have you looked on the paypal site?  As with all payment gateways, Paypal has been known to change their process/parameters in the past so you have to understand that your custom code will have to be adjusted to align with paypal.

Here is one link that may be helpful -- https://cms.paypal.com/us/cgi-bin/?cmd=_render-content&content_ID=developer/e_howto_api_nvp_errorcodes

I would double check your payment and your shipping gateway settings.

This may be a long shot, but for example, if you are using UPS rates along with warehouses, it's necessary for every SKU to define a warehouse which contains the address of the sender. If the warehouse for the SKU is not set in the UPS XML in the section <Shipper> disappears that results at the following error "The XML document is well formed but the document is not valid".  Also SKUs should be determined by package and weight.

If you cannot get past this hurdle, upgrading to full source may be one option.  The latest is ECF 4.1.2. 

Hope this helps.

Mediachase Software