Repaying deferred Mahr upon the wife's request or becoming due

A: It is Wajib to pay the deferred part of the Mahr upon the wife's request. However, if a definite date was assigned for its payment; the deferred Mahr has to be paid for the wife on that specific date if she requests it. Otherwise, it is to be paid to her in case of divorce or to her heirs when she dies. May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.