How Do You Record Journal Entry for Broker Sale of Equipment?

I am a business broker of equipment. End users of equipment come to me and request my services to procure the purchase of equipment. I research the equipment they are looking to buy. I find a manufacturer or vendor that has the equipment. I obtain a price quote from the manufacturer for the equipment. I invoice the end user for the cost of the equipment including my broker's fee. The end user wire transfer the amount of funds into my account. Upon receipt of the funds I purchase thse equipment from the manufacturer and it is shipped directly to the end user. What accounting journal entry would I make to record invoicing the end user, receiving the funds from the end user and the purchase of the equipment from the manufacturer. Thank you for your assistance.

Travis