I've switched your account to trial plan. You'll be able to remove users and theirs documents to meet your personal plan account limits. Please go to "Team" top menu options to manage users and documents.
Sorry for delayed answer. We're heavy involved in other product right now. We'll back to Vertabelo in January.
Public API is limited to downloading a model and its SQL script. Other operations are for internal (frontend) use only. What kind of integration are you interested in?
I've sent an email.
Please told them to sign in and prolong the graduation date. There will be button available just after sign in.
Customer support service by UserEcho