Iowa Code § 554.1204: Value.

Except as otherwise provided in Articles 3, 4, 5, and 14, a person gives value for rights if the person acquires them:

1. in return for a binding commitment to extend credit or for the extension of immediately available credit, whether or not drawn upon and whether or not a charge-back is provided for in the event of difficulties in collection;

2. as security for, or in total or partial satisfaction of, a preexisting claim;

3. by accepting delivery under a preexisting contract for purchase; or

4. in return for any consideration sufficient to support a simple contract.