Is it permissible for an employee to accept a commission (gift) from a hotel his work deals with, given that it has recently become clear that this hotel has opened a "bar"?

If it is highly probable that the travelers intend to use the hotel for committing forbidden acts, then it is not permissible to distribute advertisements and coupons to them. This is because it constitutes cooperation in sin and aggression. In such a case, the commission earned is forbidden and must be disposed of by spending it on public welfare. However, if the travelers' intentions are unknown, there is no harm in distributing the advertisements, provided they do not promote the bar, though it is better to refrain from doing so.