ALERT: PayPal Direct Payment Error (0 <!-- Approved -->)

I've received this error a couple of times. The customer is redirected back to stage 2 of the checkout process, but payment goes through.

The subject of the email alert:
ALERT: PayPal Direct Payment Error (0 <!-- Approved -->)

The body of the email alert:

0 -

The error log generated (personal information removed):

2008-10-17 05:03:08
-------------------
(live transaction) --> https://payflowpro.verisign.com/transaction
Request Headers: 
Array
(
    [0] => Content-Type: text/namevalue
    [1] => X-VPS-Timeout: 45
    [2] => X-VPS-VIT-Client-Type: PHP/cURL
    [3] => X-VPS-VIT-Integration-Product: PHP::Zen Cart - Payflow Pro
    [4] => X-VPS-VIT-Integration-Version: 1.3.8a
)


Request Parameters: {DoDirectPayment} 
Array
(
    [ACCT] => ************6106
    [AMT] => 38.13
    [BUTTONSOURCE] => ZenCart-DP_uk
    [CARDISSUE] => 
    [CITY] => xxxx
    [COUNTRY] => US
    [CURRENCY] => GBP
    [CVV2] => ***
    [EMAIL] => xxxx
    [EXPDATE] => xxxx
    [IPADDRESS] => xxxx
    [NAME] => xxxx
    [PHONENUM] => xxxx
    [STATE] => xxxx
    [STREET] => xxxx
    [TENDER] => C
    [TRXTYPE] => S
    [VERBOSITY] => MEDIUM
    [ZIP] => 30904
    [REQUEST_ID] => 1224262985
    [USER] => xxxx
    [PWD] => xxxx
    [PARTNER] => xxxx
    [VENDOR] => xxxx
)


Response: 
Array
(
    [RESULT] => 0
    [PNREF] => EQEP2F0DFCF5
    [RESPMSG] => Approved
    [AUTHCODE] => 111111
    [AVSADDR] => X
    [AVSZIP] => X
    [CVV2MATCH] => Y
    [PPREF] => 12113813RC956000Y
    [CORRELATIONID] => d3e6651d2f4a9
    [PROCAVS] => G
    [PROCCVV2] => M
    [IAVS] => N
    [REQUEST_ID] => 1224262985
    [CURL_ERRORS] => 
)


DoDirectPayment, Elapsed: 3116ms -- Succeeded

Does anyone know why this error is being generated? I was thinking perhaps it timed out, then approved?

Any help would be much appreciated, or please let me know if you need more information.

Thanks.

Is this the same problem as reported in this post? http://www.zen-cart.com/forum/showthread.php?t=110910
When did it start happening?

I don't think it's exactly the same error, or if it is, it's presenting differently for me.

My email doesn't have the text:

ALERT: PayPal Direct Payment Error (0 )
Dear store owner,
An error occurred when attempting to initiate the payment-validation transaction. As a courtesy, only the error "number" was shown to your customer. The details of the error are shown below.

Approved

It just says:

The subject of the email alert:
ALERT: PayPal Direct Payment Error (0 <!-- Approved -->)

The body of the email alert:

0 -

It has happened a total of 7 times since 5th April. Let me know if you want to see the other logs.

Or this one? http://www.zen-cart.com/forum/showthread.php?t=85903
I'd suggest trying the fix in post #24 of this one regardless.

DrByte:

Or this one? http://www.zen-cart.com/forum/showthread.php?t=85903
I'd suggest trying the fix in post #24 of this one regardless.

Sorry for the slow reply.

No, it appears that this error is different to both errors mentioned in the above thread.

1. We are not getting a 500 Internal Server Error as in: http://www.zen-cart.com/forum/showpost.php?p=497056&postcount=6 and we are getting 'Succeed' at the bottom, not 'Failed.

2. We are getting a transaction ID being generated.

I have applied the fix in post 24 and will wait and see if that solves the problem.

When you get that email, does the order actually get stored in your admin orders list properly?

Sorry, should've mentioned that at the start. No, an order is not created in Zen-Cart.

Okay, well at least the error-detector is properly rejecting the transaction when the error is triggered.
Now ... gotta figure out what's triggering it incorrectly.
Can you PM me with a link to a zip of the logs which show evidence of more of those kinds of transactions?