Is it permissible to act as an intermediary for foreign companies to secure business deals in exchange for a percentage, knowing that the intermediary is not an employee of these companies but rather uses legitimate connections for promotion? And is the money earned from this permissible (halal) or forbidden (haram)? And in the case of it being forbidden, should it be abandoned or given as charity to Muslims?

It is not permissible to agree with a company to provide them with work in exchange for a percentage of their profits, due to the uncertainty (Jahalah) regarding the wage. To correct the transaction, the wage must be known and fixed, and there is no harm in paying it in installments. This is provided that the company's activity is permissible; otherwise, it is not permissible, as it falls under cooperation in sin. In the event that the transaction is void due to uncertainty of the wage, the questioner is entitled only to the wage of the like (Ajr al-Mithl).