On the CPI If the site is closed and/or a purchase cannot be made, the shop fee will be changed to $3
The guidelines I have in front of me (07/20/2020) says:
"When you arrive Section"
If the Drive In/Stall are completely close, switch to Drive Thru if the location has one that is open.
If you don't get a responds with in 5 minutes change stales and keep timing.
I had a shop this last week were I had to change stalls several times because the were not working, could not understand them, or just would not answer. I had wait time of 35 minutes before they took my order . Then I had to wait 15 minutes before I got my food.
I did have a shop last month that I had that was closed when I had arrived (100 mile drive) I called the number on the CPI and found out they had no internet and had been waiting for the internet provider to show up for three days, they did pay the shop in full.