A plug-in that checks & compares the Zip Code entered by the customer with the State they have selected.
A plug-in that checks & compares the Zip Code entered by the customer with the State they have selected, then give an error message if the two can't coexist.
For example, they entered the Zip Code as 94950 (which is mid-California) but then used the pull-down to enter Arizona as their State.
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