Thanks so much for your response. Unfortunately, this is probably a bit of a deal-breaker for my client. I've found some workarounds but it's a bit messy.

That said, if there is a possibility of this being an option in the future, my client would like to activate their account and keep going. A lot of work has been done during the trial period in order to test your system (manual uploads of products and services, clients, emails and invoicing setups). How long will these details be available on the trial account after it expires? In other words, how long does my client have before he has to activate the account with payment and proceed to use the account using the work that has already gone into this setup?