Article 312. Performance of an obligation to an appropriate person

1. Unless otherwise provided by agreement of the parties and derived from the customs or substance of the obligation, the debtor is entitled, in the performance of the obligation, to demand proof that the performance of the host 2. If the creditor ' s representative acts on the basis of the powers contained in the the debtor is entitled not to perform the obligation of that representative pending confirmation of his or her credentials from, inter alia, the date of submission of the document in writing. a statement of power of attorney certified notarized, except as provided in the law, or where the written authorization was submitted directly by the creditor d The debtor (art. 185, para. 3) or where the power of the representative of the creditor is contained in the contract between the creditor and the debtor (art. 185, para. 4).