All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger. We ask Allaah to exalt his mention as well as that of his family and all his companions.
There is no harm in accepting the incentives that the company gives to the employees in order to incite them for more effort or to obtain more profit.
However, it should be noted that if the financing system that the purchasing company deals with involves Ribaa (i.e. usury or interest) then it is not permissible to facilitate for it the procedures of purchase, as if one does so, he is helping them in Ribaa. Indeed Allaah Says (which means): {Help you one another in virtue, righteousness and piety but do not help one another in sin and transgression. And fear Allaah. Verily, Allaah is Severe in punishment.}[Quran 5:2].
The financing with Ribaa is as follows: the company pays the price of goods for a given customer, and then it orders him to repay by instalments with an interest in return for the delay in payments, and they call this increase in price a profit. But indeed this is nothing but a contract with Ribaa and it is forbidden in Islam.
Allaah Knows best.