Checks the received packet.
After the response to the authentication request is received from the 3DS Server control, call CheckAuthResponse to verify and parse the response. See the 3DS Server's SendAuthRequest method for details about obtaining the response.
Before calling this method, ACSRootCerts must be populated with the root certificates used by the ACS to sign the response. This method will validate the signature of the signed content if present.
After calling this method, inspect TransactionStatus to determine if the transaction requires a challenge. If TransactionStatus is C, a challenge is required and SendChallengeRequest should be called to proceed with the challenge flow. If TransactionStatus is D, decoupled authentication will take place outside of the 3-D Secure flow and the results will be posted to the 3DS Server.
If TransactionStatus is Y or A, the transaction is complete.