Ask for the Money Up Front
This is simply the best way to do it, however, you can##Q##t blame them if they are suspicious and wonder if they will get what they have paid for. Nevertheless, that##Q##s not for you to worry about, IF they came to you. If you go to them, then this method may or may not work. Imagine you ask someone to support your business then give you the money before you do the work, that##Q##s kind of an insult and it looks like you are desperate for money. Treat each situation accordingly