A Keypad Menu is a specialized menu interface that appears within the chat’s keyboard area, replacing the standard input field. It provides users with an interactive, tap-based experience without the need to type messages.
This menu is triggered through the Chat Navigation Button and displays a set of structured buttons or form elements defined in a provisioned menu. It enables a seamless, app-like workflow inside the chat, guiding users through actions such as making selections, submitting forms, or navigating between screens.
The Keypad Menu enhances usability by offering structured navigation in a natural and chat-native way, reducing friction and improving user engagement. Use
setNavigationButton is link a Chat Navigation Button with a specific Chat Menu as a starting point. 
setNavigationButton