[ic] b_zip for Authorize.net [charge]

[Grant]

I set up kind of a virtual terminal so I can enter order number, card
number, and expiration date to charge a card.  I'm using [cgi] to set
b_address and b_zip and [update values] following that.  The value of
b_zip doesn't show up in the Authorize.net response here:

[uneval name="payment_result"]

but the value of b_address does.  Does anyone know what might be
causing me trouble here?  I've been over my code very carefully.  I'm
using IC 5.0.

- Grant