stipulation or application of party given benefit of period – OK;
to be valid: must be debtor’s choice or w/ consent of debtor
Requisites for the Application of payment:
1. Various debts of the same kind
2. Same debtor
3. Same creditor
4. All debts must be due
Exception: there may be application of payment even if all debts are not yet due if:
a) parties so stipulate
b) when application of payment is made by the party for whose benefit the term has been constituted
5. Payment is not enough to extinguish all debts