He was offered a large fee to receive money in his account
You should have told us the source of the money – is it halaal or haraam, so long as you know for sure.
If the source of the money is haraam, such as drugs for example, then it is not permissible for you to accept this fee, because it is a means of spreading corruption and making haraam things easily available, and concealing evil. This is a kind of money laundering and it is not permissible to help in that, because Allaah says (interpretation of the meaning):
“Help you one another in Al‑Birr and At‑Taqwa (virtue, righteousness and piety); but do not help one another in sin and transgression. And fear Allaah. Verily, Allaah is Severe in punishment”
If you do not know the source of the money, you should not do this thing unless the person tells you what the source of the money is and why he is seeking your help. If it becomes clear that the matter is free of any haraam elements, then it is permissible for you to help him.
We should also point out that the method mentioned may also be a means of deceiving and stealing.
And Allaah knows best.