I did a consulting job for my old boss with who I have a good relationship. He contracted me to do some work for him at an agreed upon hourly rate. I completed the project two months or so ago but he has been emailing back and forth with some additional minor questions. I haven't head from him in a couple of weeks.
It isn't a ton of money but I paid someone to do some of the more tedious parts of the job, so I am out a couple hundred dollars and a pretty big chunk of time. I would like to do more jobs like this in the future and would also liked to be paid. I know he is just busy and he isn't trying to get one over on me. What is the best way to email him to ask for payment while not hurting my chances of him to hiring me in the future. I was going to write:
If you do not need anything else from me for this project I would like to discuss my payment."
I am uncomfortable sending that email but do know what to write.
EDIT: I do not have the hourly rate in writing but I know he will pay me I am more concerned with coming off as rude. I have not sent him an invoice.