PayPal 400 Bad Request, more specific?

Question

Is there any way to get a more specific PayPal error than 400 bad request? I saw someone doing something like this:

if (ex.InnerException is ConnectionException)
{
    Response.Write(((ConnectionException) ex.InnerException).Response);
}
else
{
    Response.Write(ex.Message);
}

But that doesn't seem to do anything different for me, all the error says is: "The remote server returned an error: (400) Bad Request."

I've read that it could have something to do with some sort of validation error, but I've tried changing the data I'm sending to PayPal, but all with no luck so far.

I hope you can help me, thank you!

EDIT:

Thanks to Aydin I managed to find this error-message in one of the HTTP requests through Fiddler:

{"name":"VALIDATION_ERROR","details":[{"field":"payer.funding_instruments[0].credit_card.number","issue":"Value is invalid"}],"message":"Invalid request - see details","information_link":"https://developer.paypal.com/webapps/developer/docs/api/#VALIDATION_ERROR","debug_id":"dd5f11f6e9c98"}

Answer 1

You can save yourself time by installing Fiddler, by doing so you can see the exact HTTP Web Requests that you send, and the responses that you receive before it even begins to be processed by your application.

Here's an example of me browsing to, example.com. You can see the requests sent from my browser on the right top half, and the response in the bottom right half including all the headers and everything... Attempting to debug HTTP traffic using exception management alone will drive you insane.

Direct Link

Answer 2

Along with using Fiddler (which I highly advise using, as it's a fantastic tool), you can also change your catch logic to the following to get the response body details:

try
{
    var payment = Payment.Create(...);
}
catch(PayPalException ex)
{
    if(ex is ConnectionException)
    {
        // ex.Response contains the response body details.
    }
    else
    {
        // ...
    }
}

... or ...

try
{
    var payment = Payment.Create(...);
}
catch(ConnectionException ex)
{
    // ex.Response contains the response body details.
}
catch(PayPalException ex)
{
    // ...
}

Also, if you're using version 1.4.3 (or later) of the PayPal .NET SDK, you can access the details of the previous request and response via the following public static properties:

• PayPalResource.LastRequestDetails.Value
• PayPalResource.LastResponseDetails.Value

Each of these properties are set whenever the SDK makes a new call to the API.