I realize that some of the AI Chat Bot, that is not include the AI API key, we need to pay extra to get the API key from ChatGPT, Gemini etc with limited credit. So I see Charla chatbot provide unlimited Chatbot, is that I no need to pay other extra cost?

I plan to use in my WordPress website, can I provide all my website link, include product, post and page to it as knowledge base?

Do you provide any demo version with few day try, so I can try it before make decision?

Max
Regards