What is the ruling on taking a sum of money (10% of the credit value) in exchange for assistance in obtaining dollars at the official rate from the bank, given that there is no other way to obtain them?

It is permissible to give commissions to intermediaries in exchange for obtaining a sum of hard currency, provided that their method is legitimate and does not involve bribery, deception, or trickery. Rather, it should be based on their expertise and knowledge. However, if obtaining the sum requires bribery, trickery, or deception, then it is not permissible.