[A Gift or Present Given to Achieve a Purpose]

Answer—and Allah is the One who grants success: What appears to me is that this is
permissible. A merchant may market his goods, entice customers, and honor them—offering hospitality, a gift, a present, a prize, drinks, and the like that draw them to him. Jurists of the madhhab have discussed gifts given for a purpose or for an implicit or explicit consideration. Among their rulings is that the donor may revoke the gift if the intended purpose has not materialized.

Source: Min Thimār al-ʿIlm wa al-Ḥikmah vol.2