As a general rule, partial or incomplete or irregular performance can extinguish an obligation.

In obligations to give, the creditor can demand the delivery of something with superior quality.

Payment made by a 3rd person automatically creates subrogation.

It is payment in kind

As a general rule, payment should be made in what currency?

The creditor cannot require the delivery of a superior quality, the debtor cannot deliver something of inferior quality. What is this called?

Who should answer expenses incurred in the course of payment or performance?

Where is the default place of payment?

Payment may mean other acts that extinguishes an obligation.