I've just upgraded to Trello Premium, and only after the payment was submitted did I get the notice that if a board guest is on more than one board, I will be auto-billed for them as well. Seems like that info should be clear up front - I've used a personal card as my company does not currently subscribe - but that being said:
1) is there any notice that I'm going to be billed BEFORE it actually happens so that I can remove them if necessary? Or an option to not allow access until the additional payment is approved?
2) if they already have a subscription (standard or premium), will I still be billed for that person?
Thanks.