According to the Authorize.net documentation, the address info is required under the following circumstances:
Required if merchant would like to use the Address Verification Service security feature.Required when using GPN Canada or WorldPay Streamline Processing Platform.
For more information on AVS, see the Merchant Integration Guide at http:// www.authorize.net/support/merchant/
so it looks like it should be OK to remove those fields if you disable the Address Verification Service security feature in your account.
