الجواب حامدا و مصلیا
If someone is responsible for managing the sales of a company and is paid by the company to fulfill this task then it is not permissible for him to take a commission from any of the buyers or sellers he may interact with during any transaction, regardless of whether the company will suffer a loss or not. For this reason, it is not permissible for the questioner to take a commission from the suppliers of the company without it being acknowledged by the company. This should be avoided.