wordpress plugin chat bot ai

hi, we an wordpress chat bot plugin to be made, which will parse data from website and will answer customer questions (the ai engine will discover closer question to answer). we have to add tripe to take payments. the chat bot plugin will be freemium model, for a certain simultaneous chat , it will be free, after that for more simultaneous chats with customers the client has to pay monthly subscription, we will have a super admin panel from where we can control this. wordpress admin can add custom answer to question, the ai will detect similar questions and will answer. here again we want freemium model, we want to limit the number of manually entered question to answers depending on monthly subscription the client has purchased.