Hi, I have developed a lot of chatbots using WATI's Chatbot Builder and I also have experience using other bot builder tools such as ManyChat and Landbot.
I would be very comfortable building the WhatsApp API Based Chatbot Flow using Message Bird.
To get started, I would need to know your expected flow. Example, what happens when a user sends a message, etc.
Feel free to reach me for any questions.
Thank you.