Client (on Tuesday): I was X features on my website before the weekend!
Me: Sure thing, I can do that. Just a reminder, my rates are $Y/hr and the changes won’t go up until I’ve been paid in full.

(Thursday morning)
Me: Here’s the changes you’ve requested on the test environment, please review. Also here’s the invoice for my work, as soon as that’s paid I can upload the changes.

Annnnnddd silence since then... I’m glad that I don’t have to count on just one client’s payment, but if you wanted before the weekend and I have it all set up, please don’t ghost me.