Reply Buttons Message includes up to 3 options —each option is a button. This type of message offers a quicker way for users to make a selection from a menu when interacting with a business. Reply buttons have the same user experience as interactive templates with buttons. Note: Modify YourRegion in the URL to the right to reflect your tenant’s region. See know your endpoint page.
Refer to the below page https://developers.imiconnect.io/reference/channel-specific-status-codes-1#whatsapp