I don't use a process for this, but my idea of how I would do it is this:
The easiest solution to this is sell a digital gift card and make a policy that gift cards are non refundable
additionalllyn a policy that when used for deposits on xyz, all gift cards will be will be canceled if in breech if 123 and post it publicly And on your site
It's free to zero a gift card
Fees to refund deposits if you do refund can get expensive
No need to track payments, you just apply the code at check out
