Customer Paid Expenses

Hello Everyone,

We have a client overseas that would like to have work done to a vehicle he is buying from us before it ships to him.  He is wanting to pay us for the work and then we remit that payment to the shop actually doing the work.  (We only sell the vehicle, do not work on it).  I know if we do this for him it will show up as "profit" in our sales and then an expense when we pay the vendor.  I am curious if anyone else does anything like this with their company where the money is basically just passing through.  My concern is not reporting it correctly and then being taxed on it even though we are not making any money on the transaction.  How do you all handle situations like this?  Thanks in advance!