Gary, I don't have the codes handy, but there are two places in the CA Commercial Code that allows the provisions of the code to be varried by agreement. Change your deposit agreement to say that all stops are valid 6 months, no matter how received. You want to cover verbal as well as internet.
Also, do a search here. This topic has been beaten before, but it has been a long time.
Al
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Al Miller, CRCM
Opinions expressed are my own and not necessarily shared by my employer.