Payment to Incapacitated Persons and Third Parties in Art. 1241

In what situation can a debtor compel a creditor to receive a different thing in place of what is due?

When is a payment made to a third person considered valid?

What makes a payment to an incapacitated person valid according to Art. 1241?

When does a payment made in good faith to any person in possession of the credit release the debtor?

According to Art. 1243, when is a payment made to the creditor by the debtor deemed invalid?

In obligations to do or not to do, what is stated about substituting an act or forbearance against the obligee's will?

In a dation in payment, what law governs the transaction when property is alienated to the director in satisfaction of a debt in money?

When the quality and circumstances of an indeterminate or generic thing have not been stated, what can the creditor not demand according to Art. 1246?

Regarding extrajudicial expenses required by the payment, who is responsible for them as per Art. 1247?

Is the creditor allowed to compel partial receipt of prestations according to Art. 1248?

What currency should debts be paid in as per Art. 1249?

When does the delivery of promissory notes or other mercantile documents produce the effect of payment according to Art. 1250?