Idaho Code § 28-5-104
A letter of credit, confirmation, advice, transfer, amendment, or cancellation may be issued in any form that is a record and is authenticated (i) by a signature or (ii) in accordance with the agreement of the parties or the standard practice referred to in section 28-5-108 (5).
[28-5-104, added 1996, ch. 7, sec. 2, p. 11.]