Reply keyboard
A message with a menu under the input field: the buttons stand in for the phone keyboard, and the person taps them like quick replies.

When to use it
- A standing main menu: "Catalog", "Cart", "Contacts".
- Ready answers instead of typing.
What the person sees

How long the menu stays
The menu stays under the input field until another reply keyboard replaces it with its own, or a "Remove keyboard" step takes it away.