What are the types of acceptable evidence for proving a contractual relationship and financial obligation in commercial lawsuits, and what is their effect when acknowledged by the other party or when no rebuttal is presented?

Written documents bearing the signature and seal of the obligor, such as applications for opening deferred payment accounts, promissory notes, and balance confirmations, are considered strong and conclusive evidence of the contractual relationship and financial obligation. This evidence is deemed binding against the party from whom it originated, especially if they deny it without presenting proof of their financial discharge, in accordance with Article 29 (Paragraph 1) of the Commercial Courts Law.