Deposits on parts

Non-refundable deposits are a standard business practice. What kind of deposit is a refundable deposit?
I see what u mean. But I am not a business. I am also not a bank and do not charge interest. I have waited for payments to come on a certain date. Never showed. So a couple days later I message them an they say the payment will be next month. Maybe yes and maybe no. That’s why I made these stipulations. Kim