CyberSource Simple Order API Capture PayPal transaction

[FlanZarianick]

I'm attempting to capture a PayPal transaction that has been authorized using the PayPal button. I'm trying to use CyberSource Simple Order API to do this. I have the only 3 pieces of information that seem to come back from the PayPal button are: payerID, paymentID and paymentToken. I've tried a few ways of handing this off to the Simple Order API, but always get a 102 code with the DECLINE message in the response. Cybersource's logging system indicates this is because The following request field(s) is either invalid or missing: request_token.

Do I need to conduct the whole transaction - authorize and capture - via cybersource? Or what is the way I can take the paypal-generated button and authorize a transaction, then capture it via CyberSource?

Here's my code snippet for the CyberSource SOAPI request:

RequestMessage request = new RequestMessage
{
    merchantID = WebConfigurationManager.AppSettings["cybs.merchantID"]
    , payPalDoCaptureService = new PayPalDoCaptureService {
            run = "true"
            , invoiceNumber = orders
            , paypalAuthorizationId = authId
            , paypalAuthorizationRequestToken = requestToken
            , completeType = "Complete" }
    , clientApplication = "MyClient Application"
    , clientApplicationVersion = "2.0"
    , clientApplicationUser = userName
    , clientEnvironment = WebConfigurationManager.AppSettings["Tier"]
    , merchantReferenceCode = orders
    , customerID = OrderConstants.CustomerNumber
    , merchantDefinedData = new MerchantDefinedData { field1 = "Customer #: " + OrderConstants.CustomerNumber, field2 = orders }
    , purchaseTotals = new PurchaseTotals { currency = "usd", grandTotalAmount = total, taxAmount = taxtotal }
    , item = items.ToArray()
};

ReplyMessage reply = new ReplyMessage();
try
{
    reply = SoapClient.RunTransaction(request);
}
catch (Exception ex)
{
    reply.decision = "SYSTEM ERROR";
    reply.additionalData = string.Format("Error processing request. Exception message: {0}", ex.Message);
}

 (Example 21 Request for payPalDoCaptureService).  omegleshagle You'll need to ctrl+f to find it.

RequestMessage request = new RequestMessage
{
    payPalDoCaptureService_run=true
    , merchantID = WebConfigurationManager.AppSettings["cybs.merchantID"]
    , merchantReferenceCode = HTNsubscription9647
    , purchaseTotals = new PurchaseTotals { currency = "usd", grandTotalAmount = total, taxAmount = taxtotal }
    , payPalDoCaptureService = new PayPalDoCaptureService 
      {
         run = "true"
        , invoiceNumber = orders
        , paypalAuthorizationId = authId
        , paypalAuthorizationRequestID = authReqId
        , paypalAuthorizationRequestToken = requestToken
        , completeType = "Complete" 
      }
}