La. Civ. Code art. 1864
Current with operative changes from the 2024 Third Special Legislative Session
An obligor who owes several debts to an obligee has the right to impute payment to the debt he intends to pay.
The obligor's intent to pay a certain debt may be expressed at the time of payment or may be inferred from circumstances known to the obligee.
La. C.C. § 1864