Q: Why would the results of the AVS check be unknown?

A: The main reasons for the results of the AVS checks being unknown are:

1. The relevant address data was not passed in with the transaction – the address numeric check is carried out across the Address1, Address1, Address3, Address4, City & State fields – if none of them are present, then the state of the address numeric check will be unknown. Similarly, the post code check is carried out of the field PostCode & if that is not present, then the state of the post code check will be unknown.

2. If the transaction is a cross reference transaction & the respective address information was not submitted with the transaction, or was not submitted or unknown for the transaction being referenced, then the result will carry forward to this transaction

3. If there was a problem contacting the provider, or the provider itself had a problem delivering the results of the AVS checks (least likely reason)