I'm sure for people with less money, they could just have it on their person. But what about middle income to the 1%? Would they have basements full of gold? Or was there a bank system where people could put money in vaults and pull it out as necessary?
I wrote up an answer here that I think is fairly comprehensive. I can clarify points if needed. https://old.reddit.com/r/AskHistorians/comments/fizihp/how_did_the_medici_bank_work_was_there_a_physical/