Can i specify a paypal monetary source

I have PayPal listed as a source of funds for my iCloud stuff. I know that sometimes at other sites I get asked during the PayPal payment which bank account that I actually want the money to come from. Does making iCloud payments do that? Or does an iCloud payment take money from PayPal’s default source. I don’t want to find out via experimentation because if it’s automatic then I would have to search which bank the money was taken from.