What is MasterCard Virtual Payment Client 2-Party Payment Model POST URL

What is MasterCard Virtual Payment Client 2-Party Payment Model POST URL

Alright Just to give you a some background MasterCard VPC. I am working on
Merchant Integration for a client that uses a bank in Taiwan. They use
this MasterCard VPC for direct API integration with my web client/api.
Below is direct quote from there documentation:
"Party Payment Model The 2-Party Payment Model can be used for any payment
application, except where Verifed by Visa™ and MasterCard SecureCode™
Authentication is required. • Data is sent via a form POST to "https:// V
P C _ UR L/vpcdps" • Does not support GET data transfer. The request will
be rejected."
I have used the "" and the response is always host not found. Am I
supposed to know this VPC_URL part? Is it specific to the bank I am
integrating with? This is using a known POST response method that does
work ( for 30 other merchants). Also even if the data I am passing to
through the POST is wrong I should still get a response.
Note: Captured Response from Fiddler
HTTP/1.1 502 Fiddler - DNS Lookup Failed Date: Fri, 23 Aug 2013 15:30:32
GMT Content-Type: text/html; charset=UTF-8 Connection: close Timestamp:
10:30:32.165
[Fiddler] DNS Lookup for "vpc_url" failed. No such host is known
PS: First time asking a question for stackoverflow!