Cal. Commercial Code § 11501

(a) Except as otherwise provided in this division, the rights and obligations of a party to a funds transfer may be varied by agreement of the affected party. (b) “Funds-transfer system rule” means a rule of an association of banks (i) governing transmission of payment orders by means of a funds-transfer system of the association or rights and obligations with respect to those orders, or (ii) to the extent the rule governs rights and obligations between banks that are parties to a funds transfer in which a Federal Reserve Bank, acting as an intermediary bank, sends a payment order to the beneficiary’s bank. Except as otherwise provided in this division, a funds-transfer system rule governing rights and obligations between participating banks using the system may be effective even if the rule conflicts with this division and indirectly affects another party to the funds transfer who does not consent to the rule. A funds-transfer system rule may also govern rights and obligations of parties other than participating banks using the system to the extent stated in subdivision (c) of Section 11404, subdivision (d) of Section 11405, and subdivision (c) of Section 11507.