Answer
(Fatwa: 140/D=15/K)
When you take money from the customers as charge of your work (including the charges you give to the other people) and you have mentioned this thing clearly then you can take the remaining amount as your charges, otherwise if you take the additional amount from the customer in the name of the other people then it will unlawful to save and take the remaining amount.
Also, it is allowable to get the work done by giving bribe if the customer is in exigent and immediate need of the passport, otherwise giving bribe needlessly is unlawful.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband