Business licenses can most certainly be denied based on not following business laws. I bet you believe that the 1st Amendment protects a business that "declares" their religion keeps them from serving those of another race? another religion? a business that "declares" their religion keeps them from following safety laws? health laws?
Point of sale? Probably not. Contracted services? Probably yes.
The simple solution for an easily replaceable non nessasary service like a wedding cake is to just go to another baker, and let the baker decide who to serve. But the LGBT Gestapo such as yourself won't settle for anything less than capitulation.
None of these requests to refuse service involve point of sale items, so going there i moot. But you will anyway because that's all you have to run to.