If the day of the renewal of your subscription comes and you don't have enough cash to pay for it, your subscription to Passfolio Pro will be automatically canceled.
All features accessible through Passfolio Pro will be lost until you add money to your account in order to pay for the subscription:
Newly received dividends won't be automatically reinvested in the company that paid them. You will have to manually enter orders if you want to reinvest those dividends.
For Margin, you will no longer be able to borrow more money. However, if you had previously leveraged your account by using the Margin you had available, you will keep the money borrowed and will continue to be charged interest on it. If you want to return the money, you can do so by selling securities worth the amount of money you borrowed or depositing funds to cover the debit balance.
In case you have open orders which are exclusively available on Pro, such as Stop Orders, they will remain open until they are executed, expired or you cancel them. However, no new orders of such types will be accepted if you are no longer a Pro user.