In the event of a financial transaction with a person, a promissory note alone is not sufficient. It is necessary to prove the validity of the amount with a separate document such as a contract, a bank transfer, or witness testimony, because a promissory note is not considered proof but rather a commitment to fulfill, as explained by Article 87 of the Law of Commercial Papers. To provide better service, we are pleased to be contacted via WhatsApp at ( Phone number appears when clicking the contact button ) .