In addition to assets collected pursuant to a levy under a writ of execution, at any time after delivery of a writ of execution to a levying officer and before its return, a person indebted to the judgment debtor may pay to the levying officer the amount of the debt or so much thereof as is necessary to satisfy the money judgment. The levying officer shall give a receipt for the amount paid and such receipt is a discharge for the amount paid. (CCP 699.020)