Code Civ. Proc., § 701.050

After service of a copy of the writ of execution and a notice of levy on an account debtor obligated on an account receivable, chattel paper, or general intangible:

(a) If the account debtor has been making payments or is required to make payments to the judgment debtor, the account debtor shall make payments to the levying officer as they become due unless otherwise directed by court order or by the levying officer. Payments made to the judgment debtor after the account debtor has received notice of the levy do not discharge the obligation of the account debtor to make payments as required by this subdivision.

(b) If the account debtor has been making payments to a third person or is required to make payments to a third person (whether pursuant to a security agreement, assignment for collection, or otherwise), the account debtor shall continue to make such payments to the third person notwithstanding the levy until the account debtor receives notice that the obligation to the third person is satisfied or is otherwise directed by court order or by the third person. After the account debtor receives notice that the obligation to the third person is satisfied, the account debtor shall make payments to the levying officer as they become due unless otherwise directed by court order or by the levying officer.

(c) If pursuant to a security agreement the judgment debtor has liberty to accept the return of goods or make repossessions under the account receivable or chattel paper, the account debtor shall deliver to the levying officer property returnable to the judgment debtor unless otherwise directed by court order or by the levying officer.