Paypal Sandbox Do Direct Payment Internal Error 10001 Timeout Processing Request

This is in an MVC2 project, so I'm using C# in ASP. This is what I'm sending to https://api-3t.sandbox.paypal.com/nvp:

VERSION = 65.0
SIGNATURE = AFcWxV21C7fd0v3bYYYRCpSSRl31AxdW2pQp.tWHTjGNcHflR-LJhJ0t
USER = seller_1283487740_biz_api1.gmail.com
PWD = 1283487748
AMOUNT = 50.00
CREDITCARDTYPE = Visa
ACCT = 4031477440127509
EXPDATE = 12/2015
CVV2 =123
IPADDRESS = 127.0.0.1
METHOD = DoDirectPayment

I can GetBalance, I can produce other errors when I intentionally send something wrong, but DoDirectPayment or DoAuthorization returns开发者_如何转开发 this:

TIMESTAMP = 2010-12-24T03:35:10Z
CORRELATIONID = 2ca329fdbe3c0
ACK = Failure
L_ERRORCODE0 = 10001
L_SHORTMESSAGE0 = Internal Error
L_LONGMESSAGE0 = Timeout processing request

Why Am I getting this error?

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Yeah, I'm getting the same thing. I tested my code on their production URL and it worked just fine.

Given how much they are focused on developers, it's amazing how horrible their API is. I can get points and follow other people on their little social network, x.com, but I CAN'T TELL WHAT THE CURRENT VERSION OF THE API IS!?! (You have to view the source of the webpage and find it embedded in an HTML comment) </rant>

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From what I've read around, this can be a sign of malformed data. In my case, I was sending the form as

multipart/form-data

instead of

application/x-www-form-urlencoded

I hadn't read anywhere in the docs about form encoding, but as soon as I changed it the PP server got a lot more friendly.

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I believe its Pay Pals defence againest attacks. Theres certain procedures that action in the code

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Error codes:
* 100 Access denied
* 105 Order already exists
* 106 DID ID: DID_ID NOT found
* 107 Invalid Protocol
* 108 DID: DIDNUMBER NOT found
* 109 DID: DIDNUMBER in Pending/Remove status
* 110 DID: DIDNUMBER NOT renewed
* 111 Invalid status code. Valid codes: 0 - Disable, 1 - Enable
* 113 Order NOT found for DIDNUMBER
* 114 Order already canceled for DIDNUMBER
* 115 ORDER: Cannot cancel not pending order for DIDNUMBER. Please, use did_cancel 
* 120 UNIQ: UNIQUEKEY NOT found
* 121 No cities for this country
* 150 Sandbox error. DIDs max limit reached
* 200 Internal Server Error

Through a Sandbox control panel these error messages are given to a user if the server believes that it is under-attack.