(1) "Authorized account" means a deposit account of a customer in a bank designated by the customer as a source of payment of payment orders issued by the customer to the bank. If a customer does not so designate an account, any account of the customer is an authorized account if payment of a payment order from that account is not inconsistent with a restriction on the use of that account.

(2) "Bank" means a person engaged in the business of banking and includes a savings bank, savings and loan association, credit union, and trust company. A branch or separate office of a bank is a separate bank for purposes of this article.

(3) "Customer" means a person, including a bank, having an account with a bank or from whom a bank has agreed to receive payment orders.

(4) "Funds-transfer business day" of a receiving bank means the part of a day during which the receiving bank is open for the receipt, processing, and transmittal of payment orders and cancellations and amendments of payment orders.

(5) "Funds-transfer system" means a wire transfer network, automated clearinghouse, or other communication system of a clearinghouse or other association of banks through which a payment order by a bank may be transmitted to the bank to which the order is addressed.

(6) [Reserved.]

(7) "Prove" with respect to a fact means to meet the burden of establishing the fact (Section 1-201(b)(8)).